[llvm] [GitHub] Fix slow sccache install on macOS by upgrading macOS version (PR #77165)

[Tom Stellard via llvm-commits]

tstellar wrote:

> @tstellar, is there any way to confirm that the issue mentioned above is resolved or obsolete?

You can try removing the [workaround](https://github.com/llvm/llvm-project/blob/09e0d71ad34169e075e146e13a93b2d79f992e1d/.github/workflows/llvm-project-tests.yml#L95) and see if it still builds.

https://github.com/llvm/llvm-project/pull/77165