tests

[CI] Address problems with `cygwin` (pypa/setuptools#4832, pypa/distu… #1285

Job	Run time
test_cygwin (39, windows-latest)	5m 13s
test (3.9, ubuntu-latest)	40s
ci_setuptools (3.10, ubuntu-latest)	4m 4s
collateral (diffcov)	56s
test_msvc_python_mingw	1m 56s
collateral (docs)	32s
test (3.9, macos-latest)	1m 10s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	1m 49s
test (3.9, windows-latest)	1m 53s
test_msys2_mingw (mingw32, i686, gcc, g++)	1m 56s
test (3.13, ubuntu-latest)	43s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	1m 37s
test (3.13, macos-latest)	40s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	1m 42s
test (3.13, windows-latest)	2m 16s
test (3.10, ubuntu-latest)	46s
test (3.11, ubuntu-latest)	41s
test (3.12, ubuntu-latest)	44s
test (3.14, ubuntu-latest)	55s
test (pypy3.10, ubuntu-latest)	1m 54s
check	2s
release	0s
	32m 9s

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