Add compatibility for GTMSessionFetcher 4 #5625

Job	Run time
pod-lib-lint (ios, macos-14)	9m 30s
pod-lib-lint (tvos, macos-14)	6m 15s
pod-lib-lint (macos, macos-14)	6m 2s
quickstart (swift, macos-14, Xcode_15.3)	3m 2s
pod-lib-lint (watchos, macos-14)	3m 23s
spm-package-resolved	1m 2s
storage-integration-tests (Swift)	39m 24s
storage-integration-tests (ObjC)	9m 14s
quickstart-ftl-cron-only	0s
spm (iOS, macos-14, Xcode_15.2)	8m 6s
spm (iOS, macos-14, Xcode_16)	13m 28s
spm (tvOS, macos-14, Xcode_15.2)	5m 48s
spm (tvOS, macos-14, Xcode_16)	4m 54s
spm (macOS, macos-14, Xcode_15.2)	5m 1s
spm (macOS, macos-14, Xcode_16)	3m 21s
spm (catalyst, macos-14, Xcode_15.2)	3m 46s
spm (catalyst, macos-14, Xcode_16)	3m 36s
spm (watchOS, macos-14, Xcode_15.2)	8m 14s
spm (watchOS, macos-14, Xcode_16)	8m 21s
storage-cron-only	0s
	2h 22m 27s

Provide feedback