Lint

Bump vws-python-mock to 2026.2.21 #1182

Job	Run time
build (3.13, ubuntu-latest, manual)	30s
build (3.13, windows-latest, pre-push)	2m 19s
build (3.13, windows-latest, manual)	1m 9s
build (3.13, windows-latest, pre-commit)	1m 24s
build (3.13, ubuntu-latest, pre-commit)	35s
build (3.13, ubuntu-latest, pre-push)	1m 11s
completion-lint	2s
	7m 10s

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