ci: Re-install Python@3.9 and remove PHP for macOS

.github/workflows/build.yml

@@ -145,8 +145,19 @@ jobs:
         git fetch --prune --unshallow --tags -f
     - name: Install Dependencies
       run: |
+        export HOMEBREW_NO_AUTO_UPDATE=1
+        export HOMEBREW_NO_INSTALL_CLEANUP=1
         brew doctor || true
         brew update-reset
+
+        # Prevent updated packages from triggering PHP update
+        brew uninstall php || true
+
+        # Force update of Python, handle link issues
+        brew uninstall --ignore-dependencies python || true
+        brew install python@3.9 || true
+        brew link --overwrite python@3.9 || true
+
         brew install \
           ccache \
           coreutils \