[Database] Mark 'FIRDataSnapshot' as Sendable #3532

Job	Run time
catalyst	2m 59s
integration	9m 47s
pod-lib-lint (ios, macos-14, Xcode_15.2)	6m 16s
spm-package-resolved	1m 16s
pod-lib-lint (ios, macos-15, Xcode_16.2)	7m 2s
quickstart	6m 5s
pod-lib-lint (tvos, macos-14, Xcode_15.2)	4m 22s
pod-lib-lint (tvos, macos-15, Xcode_16.2)	3m 41s
pod-lib-lint (macos --skip-tests, macos-14, Xcode_15.2)	2m 47s
pod-lib-lint (macos --skip-tests, macos-15, Xcode_16.2)	3m 1s
pod-lib-lint (watchos, macos-14, Xcode_15.2)	1m 58s
pod-lib-lint (watchos, macos-15, Xcode_16.2)	3m 14s
spm (macos-13, Xcode_15.2, iOS)	12m 0s
spm (macos-14, Xcode_15.4, iOS)	5m 46s
spm (macos-15, Xcode_16.2, iOS)	5m 40s
spm (macos-15, Xcode_16.2, tvOS)	2m 48s
spm (macos-15, Xcode_16.2, macOS)	3m 9s
spm (macos-15, Xcode_16.2, watchOS)	5m 7s
spm (macos-15, Xcode_16.2, catalyst)	3m 33s
spm (macos-15, Xcode_16.2, visionOS)	4m 18s
database-cron-only	0s
	1h 34m 49s

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