Updated podspec for internal FirebaseCore header #3550

Job	Run time
spm-package-resolved	1m 13s
catalyst	9m 7s
pod-lib-lint (ios, macos-14, Xcode_15.2)	10m 13s
pod-lib-lint (ios, macos-14, Xcode_16)	8m 56s
pod-lib-lint (tvos, macos-14, Xcode_15.2)	6m 4s
pod-lib-lint (tvos, macos-14, Xcode_16)	8m 0s
pod-lib-lint (macos --skip-tests, macos-14, Xcode_15.2)	2m 29s
pod-lib-lint (macos --skip-tests, macos-14, Xcode_16)	2m 4s
pod-lib-lint (watchos, macos-14, Xcode_15.2)	1m 39s
pod-lib-lint (watchos, macos-14, Xcode_16)	2m 37s
spm (iOS, macos-14, Xcode_15.2)	11m 5s
spm (iOS, macos-14, Xcode_16)	8m 45s
spm (tvOS, macos-14, Xcode_15.2)	4m 12s
spm (tvOS, macos-14, Xcode_16)	5m 4s
spm (macOS, macos-14, Xcode_15.2)	4m 27s
spm (macOS, macos-14, Xcode_16)	3m 58s
spm (catalyst, macos-14, Xcode_15.2)	3m 50s
spm (catalyst, macos-14, Xcode_16)	3m 44s
spm (watchOS, macos-14, Xcode_15.2)	6m 31s
spm (watchOS, macos-14, Xcode_16)	6m 11s
core-cron-only	0s
	1h 50m 9s

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