core

Make `instanceForProtocol:inContainer:` return `nullable T` #3018

Job	Run time
catalyst	4m 41s
spm (iOS, macos-12)	6m 4s
spm (iOS, macos-13)	7m 10s
pod-lib-lint (ios, macos-12)	8m 38s
spm (tvOS, macos-12)	4m 37s
pod-lib-lint (ios, macos-13)	20m 6s
spm (tvOS, macos-13)	3m 53s
pod-lib-lint (tvos, macos-12)	5m 43s
spm (macOS, macos-12)	4m 10s
pod-lib-lint (tvos, macos-13)	5m 43s
spm (macOS, macos-13)	3m 16s
pod-lib-lint (macos --skip-tests, macos-12)	4m 3s
spm (catalyst, macos-12)	5m 44s
pod-lib-lint (macos --skip-tests, macos-13)	3m 50s
spm (catalyst, macos-13)	3m 50s
pod-lib-lint (watchos, macos-12)	2m 39s
spm (watchOS, macos-12)	4m 22s
pod-lib-lint (watchos, macos-13)	2m 48s
spm (watchOS, macos-13)	4m 29s
core-cron-only	0s
	1h 45m 46s

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