[llvm-branch-commits] [llvm] release/21.x: [CI][Github] Switch windows to server 2022 (#148743) (PR #149128)

[Tobias Hieta via llvm-branch-commits]

tru wrote:

> @tru The plan is to use the new premerge CI to test changes to the release branch, right?
> 
> We're planning on backporting any changes that we're making in `main` to make sure the release branch CI still works, assuming that is actually the plan.

Yes please.

https://github.com/llvm/llvm-project/pull/149128