Update tox to 4.21.2

[cdce8p]

https://tox.wiki/en/latest/changelog.html#v4-21-2-2024-10-03

[hauntsaninja]

Hm, it looks like there's some issue with colour codes on the Windows build. Is it related? I don't see issues on master

[cdce8p]

Hm, it looks like there's some issue with colour codes on the Windows build. Is it related? I don't see issues on master

Yeah, saw that too. Looking into it now.

[cdce8p]

Hm, it looks like there's some issue with colour codes on the Windows build. Is it related? I don't see issues on master

This is caused by tox-dev/tox#3172. Since version 4.12.0 FORCE_COLOR is now automatically passed to pytest by tox. However, the test diff output color is actually disabled for win32.

mypy/mypy/test/helpers.py

Lines 118 to 122 in 970428a

	red = "\033[31m" if sys.platform != "win32" else None
	render_diff_range(expected_ranges, expected, colour=red)
	sys.stderr.write("Actual:\n")
	green = "\033[32m" if sys.platform != "win32" else None
	render_diff_range(actual_ranges, actual, colour=green)

[github-actions]

According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅