fixup! CI : Remove all pre-installed homebrew packages

Author: murraystevenson

.github/workflows/main.yml

@@ -83,6 +83,7 @@ jobs:
       run: |
         brew list --formula
         brew remove --force $(brew list --formula)
+        brew install python@3.12 pipx
         # Install build requirements.
         pipx install scons==4.6.0
         brew install gpatch