work around runner-images issue 9966

Seems there's an issue where recent python versions will conflict with
the version provided by the runner-image. Let's try to work around it.

This feels a bit hacky, because we need to hard-code the specific
version, suggestions for improvements welcome.

See this ticket for details:
actions/runner-images#9966

Author: kusma

.github/workflows/sanity_checks.yml

@@ -188,6 +188,11 @@ jobs:
           brew install ninja
           python3 -m pip install --pre meson
 
+      - name: Work around runner-images issue 9966
+        run: |
+          brew unlink [email protected]
+          brew link --overwrite [email protected]
+
       - name: Sanity Checks
         run: |
           ./tools/fake_tty.py ./tools/sanity_checks.py