[Release] Update versions for Release 10.20.0 #8154

Job	Run time
Check changed files	43s
pod-lib-lint-auth (iOS)	8m 48s
pod-lib-lint-abtesting (iOS)	8m 46s
pod-lib-lint-database (iOS)	8m 18s
binary_size_metrics (iOS)	6m 20s
pod-lib-lint-dynamiclinks (iOS)	13m 15s
pod-lib-lint-firestore (iOS)	45m 27s
pod-lib-lint-functions	0s
pod-lib-lint-inappmessaging (iOS)	11m 8s
pod-lib-lint-messaging (iOS)	9m 5s
pod-lib-lint-performance (iOS)	11m 11s
pod-lib-lint-storage (iOS)	9m 43s
pod-lib-lint-remoteconfig (iOS)	12m 50s
create_report	4m 4s
	2h 29m 38s

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