[Metal] Raise the minimum support version of iOS to 11.0 (#73635)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73635
Blue and IG dropped the support for 11.0 a while ago, but Messenger still supports iOS 11.0.
ghstack-source-id: 150591223
Test Plan:
- Sandcastle
- CircleCI
Reviewed By: dhruvbird
Differential Revision: D34571539
fbshipit-source-id: 80a08704abd8c7fc921d7f7d7b380a180d5fc72c
(cherry picked from commit f4ca93c536ca4d6e20aad1740fd1fbd722523c00)
