Use Python 3.11 on MacOS

Pigweed currently doesn't support Python 3.12. Use Python 3.11 by
default.

Author: agners

.github/workflows/build.yaml

@@ -201,11 +201,22 @@ jobs:
               echo "Applying ${patch}"
               patch -p1 < $patch
           done
+          # Make Python 3.11 active
+          ln -sf ../../../Library/Frameworks/Python.framework/Versions/3.11/bin/2to3 /usr/local/bin/2to3
+          ln -sf ../../../Library/Frameworks/Python.framework/Versions/3.11/bin/idle3 /usr/local/bin/idle3
+          ln -sf ../../../Library/Frameworks/Python.framework/Versions/3.11/bin/pip3 /usr/local/bin/pip3
+          ln -sf ../../../Library/Frameworks/Python.framework/Versions/3.11/bin/pydoc3 /usr/local/bin/pydoc3
+          ln -sf ../../../Library/Frameworks/Python.framework/Versions/3.11/bin/python3 /usr/local/bin/python3
+          ln -sf ../../../Library/Frameworks/Python.framework/Versions/3.11/bin/python3-config /usr/local/bin/python3-config
+          ln -sf ../../../Library/Frameworks/Python.framework/Versions/3.11/bin/python3-intel64 /usr/local/bin/python3-intel64
       - name: Bootstrap
         working-directory: ./connectedhomeip/
-        run: bash scripts/bootstrap.sh -p all,darwin
+        run: |
+          alias python='python3.11'
+          bash scripts/bootstrap.sh -p all,darwin
       - name: Setup Build, Run Build and Run Tests
         run: |
+          alias python='python3.11'
           scripts/build/gn_gen.sh --args=" \
                                           chip_crypto=\"boringssl\"
                                           enable_rtti=true \