Lint

Add switchable HTTP transports #1229

Job	Run time
build (3.13, windows-latest, pre-commit)	36s
build (3.13, windows-latest, manual)	37s
build (3.13, windows-latest, pre-push)	36s
build (3.13, ubuntu-latest, pre-commit)	33s
build (3.13, ubuntu-latest, manual)	21s
build (3.13, ubuntu-latest, pre-push)	37s
completion-lint	2s
	3m 22s

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