chore: Update macOS alpha build workflow and Python version to 3.11

.github/workflows/macos-alpha-build.yml

@@ -26,6 +26,10 @@ jobs:
         with:
           node-version: 20
 
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11' 
+
       - uses: actions/checkout@v4
         with:
           submodules: recursive
@@ -73,6 +77,7 @@ jobs:
       - name: Bootstrap
         run: |
           cd engine
+          rm -rf /usr/local/bin/2to3
           ./mach --no-interactive bootstrap --application-choice browser 
           cd ..