Update the autoflake pre-commit hook

[stefan-anmut]

The mirrors-autoflake pre-commit was giving the following error:

Traceback (most recent call last):
  File "/Users/stefmd/.cache/pre-commit/repou4rvvmfx/py_env-python3.12/bin/autoflake", line 5, in <module>
    from autoflake import main
  File "/Users/stefmd/.cache/pre-commit/repou4rvvmfx/py_env-python3.12/lib/python3.12/site-packages/autoflake.py", line 32, in <module>
    import distutils.sysconfig
ModuleNotFoundError: No module named 'distutils'

due to the fact that the mirrors-autoflake repository that our "autoflake" pre-commit hook uses has been deprecated since the official autoflake released functionality that supports its use with pre-commit, and therefore was stopped from being maintained more than 2 years ago.

In that time, python has deprecated its distutils module from version 3.10 onwards (can read up on that here), which mirrors-autoflake still relies on, meaning it will always give the same error within our pre-commit setup (that seems to be using 3.12 as default as can be seen from the python ref in the error traceback).

To solve this, I have opted to point our "autoflake" pre-commit hook in the direction of the latest version of the official autoflake repo which doesn't have this dependency. Rather than override pre-commit's default_language_version to 3.8 (or any version < 3.10).

[csut-anmut]

Now that autoflake has official pre-commit integration, there is no need to use a mirror. Looks geat, good spot @stefan-anmut 🙌.

[jmartin-anmut]

Makes sense. Nice work 👍