tests

Add news fragment. #5854

Job	Run time
collateral (diffcov)	5m 36s
test (3.9, ubuntu-latest)	4m 13s
collateral (docs)	1m 48s
test (3.9, macos-latest)	3m 51s
test_cygwin (39, windows-latest)	16m 47s
test (3.9, windows-latest)	10m 33s
test (3.13, ubuntu-latest)	5m 12s
test (3.13, macos-latest)	3m 53s
test (3.13, windows-latest)	13m 18s
test (3.10, ubuntu-latest)	4m 13s
test (3.11, ubuntu-latest)	4m 4s
test (3.12, ubuntu-latest)	5m 44s
test (3.14, ubuntu-latest)	6m 23s
test (pypy3.10, ubuntu-latest, stdlib)	16m 42s
test (ubuntu-latest, 3.10, stdlib)	4m 26s
integration-test	0s
check	2s
release	0s
	1h 46m 45s

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