Lint

Bump vws-python-mock to 2026.2.18.2 #1170

Job	Run time
build (3.13, ubuntu-latest, manual)	35s
build (3.13, windows-latest, manual)	1m 5s
build (3.13, windows-latest, pre-push)	2m 9s
build (3.13, ubuntu-latest, pre-commit)	34s
build (3.13, ubuntu-latest, pre-push)	1m 15s
build (3.13, windows-latest, pre-commit)	1m 30s
completion-lint	2s
	7m 10s

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