sync: only use a real lock in `sync.Map` when needed #5188

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Job	Run time
build-macos (macos-13)	39m 2s
homebrew-install (16)	1m 7s
build-macos (macos-14)	19m 12s
homebrew-install (17)	57s
homebrew-install (18)	1m 10s
	1h 1m 28s