Lint

Use sync clients in respx transport tests #7492

Job	Run time
build (3.13, windows-latest, pre-commit)	1m 56s
build (3.13, ubuntu-latest, manual)	49s
build (3.13, windows-latest, pre-push)	5m 28s
build (3.13, ubuntu-latest, pre-push)	3m 30s
build (3.13, windows-latest, manual)	1m 37s
build (3.13, ubuntu-latest, pre-commit)	53s
completion-lint	4s
	14m 17s

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