Lint

Fix ty type errors in header tests #8037

Job	Run time
build (3.14, ubuntu-latest, manual)	57s
build (3.14, ubuntu-latest, pre-push)	3m 25s
build (3.14, windows-latest, pre-push)	5m 39s
build (3.14, windows-latest, manual)	2m 49s
build (3.14, ubuntu-latest, pre-commit)	1m 7s
build (3.14, windows-latest, pre-commit)	3m 24s
completion-lint	2s
	17m 23s

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