Issue running `pipenv lock` in python 3.6

### Issue description

When running `pipenv lock` on the latest pipenv version (v2021.11.15) there is an error raised.

### Expected result

No error to be raised and pipfile to be locked.

### Actual result

```
PS C:\Users\monkeyman192\AppData\Local\Programs\Python\Python36\test> ../python -m pipenv lock
Locking [dev-packages] dependencies...
 Locking...Building requirements...
Resolving dependencies...
Locking Failed!

Traceback (most recent call last):
  File "C:/Users/monkeyman192/AppData/Local/Programs/Python/Python36/lib/site-packages/pipenv/resolver.py", line 766, in <module>
    main()
  File "C:/Users/monkeyman192/AppData/Local/Programs/Python/Python36/lib/site-packages/pipenv/resolver.py", line 762, in main
    dev=parsed.dev)
  File "C:/Users/monkeyman192/AppData/Local/Programs/Python/Python36/lib/site-packages/pipenv/resolver.py", line 743, in _main
    resolve_packages(pre, clear, verbose, system, write, requirements_dir, packages, dev)
  File "C:/Users/monkeyman192/AppData/Local/Programs/Python/Python36/lib/site-packages/pipenv/resolver.py", line 711, in resolve_packages
    requirements_dir=requirements_dir,
  File "C:/Users/monkeyman192/AppData/Local/Programs/Python/Python36/lib/site-packages/pipenv/resolver.py", line 693, in resolve
    req_dir=requirements_dir
  File "c:\users\monkeyman192\appdata\local\programs\python\python36\lib\site-packages\pipenv\utils.py", line 1378, in resolve_deps
    req_dir=req_dir,
  File "c:\users\monkeyman192\appdata\local\programs\python\python36\lib\site-packages\pipenv\utils.py", line 1100, in actually_resolve_deps
    hashes = resolver.resolve_hashes()
  File "c:\users\monkeyman192\appdata\local\programs\python\python36\lib\site-packages\pipenv\utils.py", line 974, in resolve_hashes
    self.hashes[ireq] = self.collect_hashes(ireq)
  File "c:\users\monkeyman192\appdata\local\programs\python\python36\lib\site-packages\pipenv\utils.py", line 959, in collect_hashes
    hashes = self._get_hashes_from_pypi(ireq)
  File "c:\users\monkeyman192\appdata\local\programs\python\python36\lib\site-packages\pipenv\utils.py", line 917, in _get_hashes_from_pypi
    session = _get_requests_session(self.project.s.PIPENV_MAX_RETRIES)
  File "c:\users\monkeyman192\appdata\local\programs\python\python36\lib\site-packages\pipenv\utils.py", line 66, in _get_requests_session
    import requests
  File "c:\users\monkeyman192\appdata\local\programs\python\python36\lib\site-packages\pipenv\vendor\requests\__init__.py", line 48, in <module>
    from pipenv.vendor.charset_normalizer import __version__ as charset_normalizer_version
  File "c:\users\monkeyman192\appdata\local\programs\python\python36\lib\site-packages\pipenv\vendor\charset_normalizer\__init__.py", line 30, in <module>
    import pipenv.vendor.charset_normalizer.api as CharsetDetector
AttributeError: module 'pipenv.vendor' has no attribute 'charset_normalizer'
```

### Steps to replicate

Just used a very minimal pipfile (contents don't matter, but I have included anyway)

```
[[source]]
name = "pypi"
url = "https://pypi.org/simple"
verify_ssl = true

[pipenv]
allow_prereleases = true

[dev-packages]
flake8 = "*"

[packages]
jsonschema = "==3.2.0"

[requires]
python_version = "3.6"
```

-------------------------------------------------------------------------------

<details><summary>$ pipenv --support</summary>

Pipenv version: `'2021.11.15'`

Pipenv location: `'C:\\Users\\monkeyman192\\AppData\\Local\\Programs\\Python\\Python36\\lib\\site-packages\\pipenv'`

Python location: `'C:\\Users\\monkeyman192\\AppData\\Local\\Programs\\Python\\Python36\\python.exe'`

Python installations found:

  - `3.9.0`: `C:\Users\monkeyman192\AppData\Local\Programs\Python\Python39\python.exe`
  - `3.6.8`: `C:\Users\monkeyman192\AppData\Local\Programs\Python\Python36\python.exe`
  - `2.7.16`: `C:\Python27\python.exe`

PEP 508 Information:

```
{'implementation_name': 'cpython',
 'implementation_version': '3.6.8',
 'os_name': 'nt',
 'platform_machine': 'AMD64',
 'platform_python_implementation': 'CPython',
 'platform_release': '10',
 'platform_system': 'Windows',
 'platform_version': '10.0.19041',
 'python_full_version': '3.6.8',
 'python_version': '3.6',
 'sys_platform': 'win32'}
```

System environment variables:

  - `ALLUSERSPROFILE`
  - `APPDATA`
  - `COMMONPROGRAMFILES`
  - `COMMONPROGRAMFILES(X86)`
  - `COMMONPROGRAMW6432`
  - `COMPOSE_CONVERT_WINDOWS_PATHS`
  - `COMPUTERNAME`
  - `COMSPEC`
  - `DRIVERDATA`
  - `FPS_BROWSER_APP_PROFILE_STRING`
  - `FPS_BROWSER_USER_PROFILE_STRING`
  - `HOMEDRIVE`
  - `HOMEPATH`
  - `LOCALAPPDATA`
  - `LOGONSERVER`
  - `NUMBER_OF_PROCESSORS`
  - `ONEDRIVE`
  - `OS`
  - `PATH`
  - `PATHEXT`
  - `PIP_CONFIG_FILE`
  - `PROCESSOR_ARCHITECTURE`
  - `PROCESSOR_IDENTIFIER`
  - `PROCESSOR_LEVEL`
  - `PROCESSOR_REVISION`
  - `PROGRAMDATA`
  - `PROGRAMFILES`
  - `PROGRAMFILES(X86)`
  - `PROGRAMW6432`
  - `PSMODULEPATH`
  - `PUBLIC`
  - `SESSIONNAME`
  - `SYSTEMDRIVE`
  - `SYSTEMROOT`
  - `TEMP`
  - `TMP`
  - `USERDOMAIN`
  - `USERDOMAIN_ROAMINGPROFILE`
  - `USERNAME`
  - `USERPROFILE`
  - `VBOX_INSTALL_PATH`
  - `VBOX_MSI_INSTALL_PATH`
  - `WINDIR`
  - `__PSLOCKDOWNPOLICY`
  - `PIP_SHIMS_BASE_MODULE`
  - `PIP_DISABLE_PIP_VERSION_CHECK`
  - `PYTHONDONTWRITEBYTECODE`
  - `PIP_PYTHON_PATH`
  - `PYTHONFINDER_IGNORE_UNSUPPORTED`

Pipenv–specific environment variables:


Debug–specific environment variables:

  - `PATH`: `C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files\Git\cmd;C:\Program Files\PuTTY\;C:\Program Files\Oracle\VirtualBox\;C:\Program Files (x86)\WinSCP\;C:\Program Files\nodejs\;C:\Program Files\Amazon\AWSCLIV2\;C:/Hashicorp/Consul;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Users\monkeyman192\Documents\nomad;;C:\Program Files\Docker\Docker\resources\bin;C:\ProgramData\DockerDesktop\version-bin;C:\Users\monkeyman192\AppData\Local\Programs\Python\Python39\Scripts\;C:\Users\monkeyman192\AppData\Local\Programs\Python\Python39\;C:\Users\monkeyman192\AppData\Local\Programs\Python\Python36\Scripts\;C:\Users\monkeyman192\AppData\Local\Programs\Python\Python36\;C:\Users\monkeyman192\AppData\Local\Microsoft\WindowsApps;C:\Users\monkeyman192\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\monkeyman192\AppData\Roaming\npm;`


---------------------------

Contents of `Pipfile` ('C:\\Users\\monkeyman192\\AppData\\Local\\Programs\\Python\\Python36\\test\\Pipfile'):

```toml
[[source]]
name = "pypi"
url = "https://pypi.org/simple"
verify_ssl = true

[pipenv]
allow_prereleases = true

[dev-packages]
flake8 = "*"

[packages]
jsonschema = "==3.2.0"

[requires]
python_version = "3.6"

```

</details>

--------------------------------------------------------------------------------

I have debugged and had a dig around and I have found that by reverting a recent change (https://github.com/pypa/pipenv/commit/2d2a0fa15c71d21b9e516f7625a1b970930b91b9#diff-04fedfa48090328a63525cffd8618360182863732a278fb17c4c8d224888de88R30) causes `pipenv lock` to work again.
I am guessing this break occurs because of a change in python 3.7 (https://bugs.python.org/issue30024)
Also, I notice that while pipenv claims to support python 3.6, the CI build matrix doesn't include 3.6, which is probably why this change slipped through the cracks...


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Issue running `pipenv lock` in python 3.6 #4865

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Issue running pipenv lock in python 3.6 #4865

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