Issue description

When installing packages with pipenv with custom source protected by credentials fails with Python 3.9.8 (but works with 3.9.7).
Also tried using an older version of pipenv but it didn't work.

Expected result

The packages should install successfully.

Actual result

This is a snipped of logs of the failed installation:

[pipenv.exceptions.InstallError]: Looking in indexes: ***pypi-***.d.codeartifact.eu-west-1.amazonaws.com/pypi/<repo>/simple/
[pipenv.exceptions.InstallError]: WARNING: 401 Error, Credentials not correct for https://pypi-***.d.codeartifact.eu-west-1.amazonaws.com/pypi/<repo>/simple/attrs/
[pipenv.exceptions.InstallError]: ERROR: Could not find a version that satisfies the requirement attrs==21.2.0 (from versions: none)
[pipenv.exceptions.InstallError]: ERROR: No matching distribution found for attrs==21.2.0

Steps to replicate

• Install Python 3.9.8 (default now for Github Actions Python version 3.9)
• Configure custom source with credentials
• run $ pipenv install

Not posting pipenv --support because it's the same as running on Github Actions on ubuntu-latest with Python 3.9, this might be the only relevant part of Pipfile:

[[source]]
name = "repo"
url = "https://aws:'${TOKEN}'@pypi-****.d.codeartifact.eu-west-1.amazonaws.com/pypi/<repo>/simple/"
verify_ssl = true