Since support for pyproject.toml exists, Frappe has gotten rid of
requirements.txt file. However, dev-requirements.txt file still existed
in Frappe & other apps. With this, we can get rid of the separate
dev-reqs file as well and replace it by defining the deps in pyproject
under [tool.bench.dev-dependencies]

Example:

For Frappe, this transition will look like moving the contents of
dev-requirements.txt as follows:

```
\# dev-requirements.txt
coverage==5.5
Faker~=13.12.1
pyngrok~=5.0.5
unittest-xml-reporting~=3.0.4

```

```
\# pyproject.toml
[tool.bench.dev-dependencies]
coverage = "==5.5"
Faker = "~=13.12.1"
pyngrok = "~=5.0.5"
unittest-xml-reporting = "~=3.0.4"
```

Note: If dev-dependencies are defined in pyproject.toml, and a
dev-dependencies.txt file exists - the txt file will be ignored.

feat: Dev Dependencies via pyproject.toml

# [5.12.0](v5.11.0...v5.12.0) (2022-06-29)

### Bug Fixes

* (re)Install every Frappe app even if not installed to env ([ffae670](ffae670))
* fixed update_app_states call ([#1326](#1326)) ([45267fc](45267fc))

### Features

* Setup dev-dependencies defined via pyproject ([75957a5](75957a5))