Lint

Bump vws-python-mock to 2026.2.21 #1181

Job	Run time
build (3.13, windows-latest, pre-push)	3m 26s
build (3.13, ubuntu-latest, pre-push)	1m 13s
build (3.13, windows-latest, manual)	1m 8s
build (3.13, ubuntu-latest, pre-commit)	33s
build (3.13, windows-latest, pre-commit)	1m 22s
build (3.13, ubuntu-latest, manual)	28s
completion-lint	3s
	8m 13s

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