tests

Mark failing tests as xfail. Ref #4864. #6203

Job	Run time
test_cygwin (39, windows-latest)	20m 7s
collateral (diffcov)	4m 28s
test (3.9, ubuntu-latest)	4m 33s
collateral (docs)	2m 6s
test (3.9, macos-latest)	4m 43s
test (3.9, windows-latest)	10m 49s
test (3.13, ubuntu-latest)	4m 43s
test (3.13, macos-latest)	3m 38s
test (3.13, windows-latest)	12m 24s
test (3.10, ubuntu-latest)	4m 31s
test (3.11, ubuntu-latest)	4m 5s
test (3.12, ubuntu-latest)	5m 6s
test (3.14, ubuntu-latest)	8m 38s
test (pypy3.10, ubuntu-latest, stdlib)	16m 19s
test (ubuntu-latest, 3.10, stdlib)	4m 8s
integration-test	0s
check	4s
release	0s
	1h 50m 22s

Provide feedback