Add compatibility for GTMSessionFetcher 4 #5621

Job	Run time
pod-lib-lint (ios, macos-14)	10m 23s
quickstart (swift, macos-14, Xcode_15.3)	3m 52s
pod-lib-lint (tvos, macos-14)	6m 3s
pod-lib-lint (macos, macos-14)	6m 39s
spm-package-resolved	53s
pod-lib-lint (watchos, macos-14)	2m 59s
storage-integration-tests (Swift)	36m 18s
storage-integration-tests (ObjC)	18m 41s
quickstart-ftl-cron-only	0s
spm (iOS, macos-14, Xcode_15.2)	7m 15s
spm (iOS, macos-14, Xcode_16)	7m 40s
spm (tvOS, macos-14, Xcode_15.2)	4m 8s
spm (tvOS, macos-14, Xcode_16)	5m 10s
spm (macOS, macos-14, Xcode_15.2)	3m 9s
spm (macOS, macos-14, Xcode_16)	3m 36s
spm (catalyst, macos-14, Xcode_15.2)	3m 49s
spm (catalyst, macos-14, Xcode_16)	3m 39s
spm (watchOS, macos-14, Xcode_15.2)	4m 38s
spm (watchOS, macos-14, Xcode_16)	5m 16s
storage-cron-only	0s
	2h 14m 8s

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