Revert "[GitHub] Fix slow sccache install on macOS by upgrading macOS version (#77165)" (#77270)

This reverts commit 602c8fa2, due to an
sccache issue seen on larger builds using macOS-12 runners.

The issue is documented in in the following issue:
https://github.com/hendrikmuhs/ccache-action/issues/174

The original PR is the following:
https://github.com/llvm/llvm-project/pull/77165