tests

Generate `distutils-stubs` on install #6223

Job	Run time
test_cygwin (39, windows-latest)	13m 26s
collateral (diffcov)	4m 24s
test (3.9, ubuntu-latest)	4m 3s
test (3.9, macos-latest)	3m 46s
collateral (docs)	2m 5s
test (3.9, windows-latest)	3m 52s
test (3.13, ubuntu-latest)	4m 2s
test (3.13, macos-latest)	4m 4s
test (3.13, windows-latest)	3m 53s
test (3.10, ubuntu-latest)	4m 4s
test (3.11, ubuntu-latest)	3m 52s
test (3.12, ubuntu-latest)	4m 3s
test (3.14, ubuntu-latest)	4m 4s
test (pypy3.10, ubuntu-latest, stdlib)	4m 4s
test (ubuntu-latest, 3.10, stdlib)	4m 3s
integration-test	0s
check	3s
release	0s
	1h 7m 48s

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