tests

Reapply "Restore default for blank issues." #6766

Job	Run time
collateral (diffcov)	4m 17s
test_cygwin (39, windows-latest)	18m 23s
collateral (docs)	2m 19s
Fail the job if files changed under _disutils/_vendor folders	0s
test (3.9, macos-latest)	4m 5s
test (3.9, ubuntu-latest)	4m 17s
test (3.11, ubuntu-latest)	3m 57s
test (>=3.13.5, windows-latest)	11m 35s
test (3.10, ubuntu-latest)	4m 21s
test (ubuntu-latest, 3.10, stdlib)	4m 41s
test (>=3.13.5, macos-latest)	3m 49s
test (3.9, windows-latest)	10m 2s
test (pypy3.10, ubuntu-latest, stdlib)	15m 27s
test (>=3.13.5, ubuntu-latest)	4m 13s
test (3.14, ubuntu-latest)	5m 59s
test (3.12, ubuntu-latest)	4m 50s
integration-test	-1s
check	2s
release	0s
	1h 42m 16s

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