Validate `vers` qualifier #460

Job	Run time
Lint & mypy	22s
Test & build (py3.11 on ubuntu-latest)	22s
Test & build (py3.12 on ubuntu-latest)	17s
Test & build (py3.13 on ubuntu-latest)	25s
Test & build (py3.10 on ubuntu-latest)	17s
Test & build (py3.12 on windows-latest)	49s
Test & build (py3.10 on windows-latest)	43s
Test & build (py3.9 on windows-latest)	53s
Test & build (py3.11 on windows-latest)	43s
Test & build (py3.13 on windows-latest)	58s
Test & build (py3.8 on windows-latest)	1m 32s
Test & build (py3.12 on macos-latest)	16s
Test & build (py3.9 on ubuntu-latest)	18s
Test & build (py3.8 on macos-latest)	1m 16s
Test & build (py3.10 on macos-latest)	37s
Test & build (py3.13 on macos-latest)	26s
Test & build (py3.11 on macos-latest)	21s
Test & build (py3.8 on ubuntu-latest)	24s
Test & build (py3.9 on macos-latest)	46s
	11m 45s

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