[iOS] Bump up the cocoapods version (#49176)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49176
Bump up the cocoapods version
ghstack-source-id: 118305636
Test Plan: CI
Reviewed By: xta0
Differential Revision: D25466321
fbshipit-source-id: 916adc514c5edc8971445da893362a160cfc092b
