Add news fragment. #5407

Job	Run time
collateral (diffcov)	5m 13s
test (3.8, ubuntu-latest)	3m 57s
collateral (docs)	1m 54s
test (3.8, windows-latest)	15m 21s
test_cygwin (39, windows-latest)	16m 38s
test (3.12, ubuntu-latest)	5m 30s
test (3.12, macos-latest)	5m 16s
test (3.12, windows-latest)	12m 59s
test (3.9, ubuntu-latest)	4m 9s
test (3.10, ubuntu-latest)	3m 52s
test (3.11, ubuntu-latest)	3m 54s
test (pypy3.10, ubuntu-latest, stdlib)	15m 24s
test (ubuntu-latest, 3.10, stdlib)	3m 55s
test (3.8, macos-13)	6m 9s
integration-test	0s
check	3s
release	0s
	1h 44m 14s

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