[iOS] Bump up the cocoapods version (#46935)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46935
Bump up the cocoapods version
ghstack-source-id: 115283786
(Note: this ignores all push blocking failures!)
Test Plan: CI
Reviewed By: xta0
Differential Revision: D24572715
fbshipit-source-id: 41ffcd43512dc7d4e94af887fb5dfeab703d7602
