sync: only use a real lock in `sync.Map` when needed #5174

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Job	Run time
build-macos (macos-13)	6m 32s
build-macos (macos-14)	6m 10s
homebrew-install (16)	1m 0s
homebrew-install (17)	1m 2s
homebrew-install (18)	1m 29s
	16m 13s