tests

Add initial support for license expression (PEP 639) #5932

Job	Run time
collateral (diffcov)	5m 31s
collateral (docs)	2m 2s
test (3.9, ubuntu-latest)	4m 19s
test (3.9, macos-latest)	4m 3s
test_cygwin (39, windows-latest)	14m 45s
test (3.9, windows-latest)	12m 21s
test (3.13, ubuntu-latest)	5m 5s
test (3.13, macos-latest)	4m 11s
test (3.13, windows-latest)	10m 24s
test (3.10, ubuntu-latest)	4m 30s
test (3.11, ubuntu-latest)	4m 32s
test (3.12, ubuntu-latest)	5m 33s
test (3.14, ubuntu-latest)	7m 27s
test (pypy3.10, ubuntu-latest, stdlib)	16m 59s
test (ubuntu-latest, 3.10, stdlib)	4m 34s
integration-test	0s
check	2s
release	0s
	1h 46m 18s

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