[IMP] autoupdate flake8

[rrebollo]

pre-commit run -a is failing with the following traceback::

Traceback (most recent call last):
  File "/home/roly/.cache/pre-commit/repono809vyt/py_env-python3/bin/flake8", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/roly/.cache/pre-commit/repono809vyt/py_env-python3/lib/python3.12/site-packages/flake8/main/cli.py", line 22, in main
    app.run(argv)
  File "/home/roly/.cache/pre-commit/repono809vyt/py_env-python3/lib/python3.12/site-packages/flake8/main/application.py", line 363, in run
    self._run(argv)
  File "/home/roly/.cache/pre-commit/repono809vyt/py_env-python3/lib/python3.12/site-packages/flake8/main/application.py", line 350, in _run
    self.initialize(argv)
  File "/home/roly/.cache/pre-commit/repono809vyt/py_env-python3/lib/python3.12/site-packages/flake8/main/application.py", line 330, in initialize
    self.find_plugins(config_finder)
  File "/home/roly/.cache/pre-commit/repono809vyt/py_env-python3/lib/python3.12/site-packages/flake8/main/application.py", line 153, in find_plugins
    self.check_plugins = plugin_manager.Checkers(local_plugins.extension)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/roly/.cache/pre-commit/repono809vyt/py_env-python3/lib/python3.12/site-packages/flake8/plugins/manager.py", line 356, in __init__
    self.manager = PluginManager(
                   ^^^^^^^^^^^^^^
  File "/home/roly/.cache/pre-commit/repono809vyt/py_env-python3/lib/python3.12/site-packages/flake8/plugins/manager.py", line 238, in __init__
    self._load_entrypoint_plugins()
  File "/home/roly/.cache/pre-commit/repono809vyt/py_env-python3/lib/python3.12/site-packages/flake8/plugins/manager.py", line 254, in _load_entrypoint_plugins
    eps = importlib_metadata.entry_points().get(self.namespace, ())
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'EntryPoints' object has no attribute 'get'

This PR is similar to OCA/sale-workflow#3411. For more context, see OCA/oca-addons-repo-template#243.

• Updates Flake8 to a compatible version.
• Fixes pre-commit complaints triggered after the Flake8 update.

[OCA-git-bot]

Hi @sebalix,
some modules you are maintaining are being modified, check this out!