use sccache 2.15 over the outdated sccache (#52095)
Summary:
Change macos build job on CI to use newer sccache.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52095
Reviewed By: walterddr
Differential Revision: D26406024
Pulled By: janeyx99
fbshipit-source-id: a40da4acd4c01af16d30269e67c7015aff54503a
