Darwin Tests: Add missing os/lock.h import #83112

Job	Run time
Build framework (macos-release, -sdk macosx -configuration Release)	14m 3s
Build framework (macos-release, -sdk macosx -configuration Release)	14m 3s
Build framework (ios-release, -sdk iphoneos -configuration Release)	8m 0s
Build framework (ios-release, -sdk iphoneos -configuration Release)	8m 0s
Build framework (tvos-debug, -sdk appletvos -configuration Debug)	6m 46s
Build framework (tvos-debug, -sdk appletvos -configuration Debug)	6m 46s
Build framework (watchos-debug, -sdk watchos -configuration Debug)	9m 50s
Build framework (watchos-debug, -sdk watchos -configuration Debug)	9m 50s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	19m 46s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	19m 46s
Run framework tests (tsan, -enableThreadSanitizer YES)	24m 30s
Run framework tests (tsan, -enableThreadSanitizer YES)	22m 24s
Run framework tests (leaks, ENABLE_LEAK_DETECTION=1)	21m 33s
Run framework tests (leaks, ENABLE_LEAK_DETECTION=1)	21m 33s
	3h 26m 50s

Provide feedback