Lint

Make towncrier fail on invalid news fragment suffixes #1867

Job	Run time
build (3.14, windows-latest, manual)	1m 50s
build (3.14, windows-latest, pre-commit)	2m 2s
build (3.14, ubuntu-latest, pre-push)	37s
build (3.14, ubuntu-latest, pre-commit)	34s
build (3.14, windows-latest, pre-push)	2m 4s
build (3.14, ubuntu-latest, manual)	32s
completion-lint	3s
	7m 42s

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