chore: Bump ninja to 1.12 on Windows (backport #141)

[mergify]

---

This is an automatic backport of pull request #141 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 31eb857 has failed:

On branch mergify/bp/release/8.0/pr-141
Your branch is ahead of 'origin/release/8.0' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 31eb857.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .github/workflows/runtime-ci.yml

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally