Use setup python

Author: agners

.github/workflows/build.yaml

@@ -201,11 +201,12 @@ jobs:
               echo "Applying ${patch}"
               patch -p1 < $patch
           done
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
       - name: Bootstrap
         working-directory: ./connectedhomeip/
-        run: |
-          alias python='python3.11'
-          . scripts/bootstrap.sh -p all,darwin
+        run: bash scripts/bootstrap.sh -p all,darwin
       - name: Setup Build, Run Build and Run Tests
         run: |
           scripts/build/gn_gen.sh --args=" \