[CI] flake8 version is too old to be compatible with Python 3.12

[MortalHappiness]

What happened + What you expected to happen

While running the pre-commit hook of flake8, the following error occurs if Python version is 3.12.

flake8...................................................................Failed
- hook id: flake8
- exit code: 1

Traceback (most recent call last):
  File "/home/mortalhappiness/.cache/pre-commit/repo785be_6i/py_env-python3.12/bin/flake8", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/mortalhappiness/.cache/pre-commit/repo785be_6i/py_env-python3.12/lib/python3.12/site-packages/flake8/main/cli.py", line 22, in main
    app.run(argv)
  File "/home/mortalhappiness/.cache/pre-commit/repo785be_6i/py_env-python3.12/lib/python3.12/site-packages/flake8/main/application.py", line 363, in run
    self._run(argv)
  File "/home/mortalhappiness/.cache/pre-commit/repo785be_6i/py_env-python3.12/lib/python3.12/site-packages/flake8/main/application.py", line 350, in _run
    self.initialize(argv)
  File "/home/mortalhappiness/.cache/pre-commit/repo785be_6i/py_env-python3.12/lib/python3.12/site-packages/flake8/main/application.py", line 330, in initialize
    self.find_plugins(config_finder)
  File "/home/mortalhappiness/.cache/pre-commit/repo785be_6i/py_env-python3.12/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/mortalhappiness/.cache/pre-commit/repo785be_6i/py_env-python3.12/lib/python3.12/site-packages/flake8/plugins/manager.py", line 356, in __init__
    self.manager = PluginManager(
                   ^^^^^^^^^^^^^^
  File "/home/mortalhappiness/.cache/pre-commit/repo785be_6i/py_env-python3.12/lib/python3.12/site-packages/flake8/plugins/manager.py", line 238, in __init__
    self._load_entrypoint_plugins()
  File "/home/mortalhappiness/.cache/pre-commit/repo785be_6i/py_env-python3.12/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'

Versions / Dependencies

Python 3.12

Reproduction script

If python version is 3.9 -> no error

If python version is 3.12 -> has error

Upgrade the following packages to the newest version solves this issue:

• flake8
• flake8-comprehensions
• flake8-quotes
• flake8-bugbear

Issue Severity

Low: It annoys or frustrates me.

[CheyuWu]

@MortalHappiness I'd like to help with this!