[4.2.x] Migrated setuptools configuration to pyproject.toml.

This branch migrates setuptools configuration from setup.py/setup.cfg to
pyproject.toml. In order to ensure that the generated binary files have
consistent casing (both the tarball and the wheel), setuptools version
is limited to ">=61.0.0,<69.3.0".

Configuration for flake8 was moved to a dedicated .flake8 file since
it cannot be configured via pyproject.toml.

Also, __pycache__ exclusion was removed from MANIFEST and the
extras/Makefile was replaced with a simpler build command.

Co-authored-by: Nick Pope <nick@nickpope.me.uk>

Backport of 4686541691dbe986f58ac87630c3b7a04db4ff93 from main.

3 files changed, 15 insertions, 9 deletions

diff --git a/docs/internals/contributing/writing-code/coding-style.txt b/docs/internals/contributing/writing-code/coding-style.txt
index d227e04ba0..0a023ed392 100644
--- a/docs/internals/contributing/writing-code/coding-style.txt
+++ b/docs/internals/contributing/writing-code/coding-style.txt
@@ -46,7 +46,7 @@ Python style
 * Unless otherwise specified, follow :pep:`8`.
 
   Use :pypi:`flake8` to check for problems in this area. Note that our
-  ``setup.cfg`` file contains some excluded files (deprecated modules we don't
+  ``.flake8`` file contains some excluded files (deprecated modules we don't
   care about cleaning up and some third-party code that Django vendors) as well
   as some excluded errors that we don't consider as gross violations. Remember
   that :pep:`8` is only a guide, so respect the style of the surrounding code
diff --git a/docs/internals/howto-release-django.txt b/docs/internals/howto-release-django.txt
index 5c2d0b7451..ba70921ad2 100644
--- a/docs/internals/howto-release-django.txt
+++ b/docs/internals/howto-release-django.txt
@@ -58,7 +58,7 @@ You'll need a few things before getting started:
 
   .. code-block:: shell
 
-      $ python -m pip install wheel twine
+      $ python -m pip install build twine
 
 * Access to Django's record on PyPI. Create a file with your credentials:
 
@@ -222,9 +222,15 @@ OK, this is the fun part, where we actually push out a release!
    Please see `notes on setting the VERSION tuple`_ below for details
    on ``VERSION``.
 
-#. If this is a pre-release package, update the "Development Status" trove
-   classifier in ``setup.cfg`` to reflect this. Otherwise, make sure the
-   classifier is set to ``Development Status :: 5 - Production/Stable``.
+   #. If this is a pre-release package also update the "Development Status"
+      trove classifier in ``pyproject.toml`` to reflect this. An ``rc``
+      pre-release should not change the trove classifier (:commit:`example
+      commit for alpha release <eeeacc52a967234e920c001b7908c4acdfd7a848>`,
+      :commit:`example commit for beta release
+      <25fec8940b24107e21314ab6616e18ce8dec1c1c>`).
+
+   #. Otherwise, make sure the classifier is set to
+      ``Development Status :: 5 - Production/Stable``.
 
 #. Tag the release using ``git tag``. For example:
 
@@ -238,8 +244,8 @@ OK, this is the fun part, where we actually push out a release!
 
 #. Make sure you have an absolutely clean tree by running ``git clean -dfx``.
 
-#. Run ``make -f extras/Makefile`` to generate the release packages. This will
-   create the release packages in a ``dist/`` directory.
+#. Run ``python -m build`` to generate the release packages. This will create
+   the release packages in a ``dist/`` directory.
 
 #. Generate the hashes of the release packages:
 
diff --git a/docs/topics/auth/passwords.txt b/docs/topics/auth/passwords.txt
index b7b2dd4f7a..636e9a2c32 100644
--- a/docs/topics/auth/passwords.txt
+++ b/docs/topics/auth/passwords.txt
@@ -97,7 +97,7 @@ To use Argon2id as your default storage algorithm, do the following:
 #. Install the :pypi:`argon2-cffi` package. This can be done by running
    ``python -m pip install django[argon2]``, which is equivalent to
    ``python -m pip install argon2-cffi`` (along with any version requirement
-   from Django's ``setup.cfg``).
+   from Django's ``pyproject.toml``).
 
 #. Modify :setting:`PASSWORD_HASHERS` to list ``Argon2PasswordHasher`` first.
    That is, in your settings file, you'd put::
@@ -128,7 +128,7 @@ To use Bcrypt as your default storage algorithm, do the following:
 #. Install the :pypi:`bcrypt` package. This can be done by running
    ``python -m pip install django[bcrypt]``, which is equivalent to
    ``python -m pip install bcrypt`` (along with any version requirement from
-   Django's ``setup.cfg``).
+   Django's ``pyproject.toml``).
 
 #. Modify :setting:`PASSWORD_HASHERS` to list ``BCryptSHA256PasswordHasher``
    first. That is, in your settings file, you'd put::