tests

Generate `distutils-stubs` on install #6214

Job	Run time
test (3.9, ubuntu-latest)	45s
test (3.9, macos-latest)	34s
test (3.9, windows-latest)	39s
test (3.13, ubuntu-latest)	46s
test (3.13, macos-latest)	47s
test (3.13, windows-latest)	32s
test (3.10, ubuntu-latest)	47s
test (3.11, ubuntu-latest)	48s
collateral (diffcov)	47s
collateral (docs)	47s
test (3.12, ubuntu-latest)	48s
test_cygwin (39, windows-latest)	31s
test (3.14, ubuntu-latest)	36s
test (pypy3.10, ubuntu-latest, stdlib)	46s
test (ubuntu-latest, 3.10, stdlib)	45s
integration-test	1s
check	3s
release	1s
	10m 43s

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