tests

Make the validation test for entry-points work with Python 3.13+ #24

Job	Run time
collateral (diffcov)	6m 31s
test (3.8, ubuntu-latest)	1m 48s
collateral (docs)	2m 6s
test_cygwin (39, windows-latest)	16m 20s
collateral (check-extern)	18s
test (3.8, windows-latest)	1m 25s
test (3.12, ubuntu-latest)	1m 59s
test (3.12, macos-latest)	4m 58s
test (3.12, windows-latest)	1m 33s
test (3.9, ubuntu-latest)	1m 43s
test (3.10, ubuntu-latest)	2m 54s
test (3.11, ubuntu-latest)	3m 41s
test (pypy3.10, ubuntu-latest, stdlib)	1m 42s
test (ubuntu-latest, 3.10, stdlib)	1m 42s
test (3.8, macos-13)	3m 28s
integration-test	0s
check	1s
release	0s
	52m 9s

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