Assume Python 3.12 for MyPy type checking #1476

Job	Run time
mypy	23s
sdist	2m 19s
ruff	7s
parse_sdl (windows-latest, 3.2.16)	1m 14s
parse_sdl (macos-latest, 3.2.16)	46s
build-macos (pp311-*)	5m 36s
pyodide	3m 51s
build-macos (cp310-*_universal2)	2m 32s
build-macos (cp314t-*_universal2)	2m 58s
tox (ubuntu-latest)	3m 11s
linux-wheels (x86_64, pp311-manylinux*)	3m 56s
linux-wheels (aarch64, cp314t-manylinux*)	4m 21s
linux-wheels (x86_64, cp310-manylinux*)	5m 12s
test-docs	2m 7s
linux-wheels (aarch64, pp311-manylinux*)	3m 34s
linux-wheels (aarch64, cp310-manylinux*)	4m 12s
linux-wheels (x86_64, cp314t-manylinux*)	4m 57s
build (ubuntu-latest, 3.14t, x64)	5m 42s
build (windows-latest, 3.14t, x64)	4m 41s
build (windows-latest, pypy-3.10, x64)	4m 33s
build (ubuntu-latest, pypy-3.10, x64)	5m 14s
build (windows-11-arm, 3.11, arm64)	5m 31s
build (ubuntu-latest, 3.10, x64)	4m 56s
build (windows-latest, 3.10, x86)	4m 52s
build (windows-latest, 3.10, x64)	4m 25s
build (windows-latest, 3.14t, x86)	4m 48s
build (windows-11-arm, 3.14t, arm64)	5m 11s
publish	0s
	1h 41m 9s

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