fixup! CI : Remove all pre-installed homebrew packages

Author: murraystevenson

.github/workflows/main.yml

@@ -87,6 +87,7 @@ jobs:
         # Install build requirements.
         brew install pipx
         pipx install scons==4.6.0
+        brew install ninja
         brew install gpatch
         echo "/opt/homebrew/opt/gpatch/libexec/gnubin" >> $GITHUB_PATH
         brew install bison