Miscellaneous type-checking updates

[dgw]

Description

types-pkg-resources was yanked, which I discovered when submitting #2613. pkg_resources itself is typed in setuptools>=71.1, negating the need to install type stubs.

When testing that fix, I updated mypy and friends (pip install -U -r dev-requirements.txt) and found a few more new type-check errors caught by the newer tools:

• SopelIdentifierMemory.update()'s signature isn't compatible with its supertype (fixed by adding typing_extensions.override decorator; can't go stdlib-only until py3.12…)
• tools.OutputRedirect calls methods on sys.__stdout__ and sys.__stderr__, which are allowed to be None and therefore have to be guarded with ifs (I'm glad this class is deprecated)

Checklist

• I have read CONTRIBUTING.md
• I can and do license this contribution under the EFLv2
• No issues are reported by make qa (runs make lint and make test)
• I have tested the functionality of the things this change touches

Notes

All of this needs backporting to the 8.0.x maintenance branch, which is why this has the 8.0.1 milestone.

[dgw]

Manually re-running CI jobs got them to pass, but I do not like the random failure in 3.9's sopel/builtins/rand.py::test_example_rand_4 test that canceled the remaining unfinished jobs. I believe this error should be impossible, but it happened somehow and probably needs its own investigation (😩):

=================================== FAILURES ===================================
_____________________________ test_example_rand_4 ______________________________
sopel/tests/pytest_plugin.py:137: in test
    assert len(outputs) == expected_output_count
E   AssertionError: assert 9 == 10
E    +  where 9 = len(['random(0, 2): 1', 'random(0, 2): 1', 'random(0, 2): 1', 'random(0, 2): 2', 'random(0, 2): 1', 'random(0, 2): 1', ...])

Based on the output, test_example_rand_4 is this example in sopel/builtins/rand.py:

sopel/sopel/builtins/rand.py

Line 17 in 1237568

@plugin.example('.rand 2', r'random\(0, 2\): (0|1|2)', re=True, repeat=10)

How could repeat=10 somehow yield only 9 outputs? OTFGK??

[Exirel]

Yeah all good, I'm glad we have the mypy check in the CI.

And also this:

removed_in='8.1'

Can't wait for that!