Update faber

Author: stefanseefeld

.github/workflows/test-ubuntu.yml

@@ -28,6 +28,10 @@ jobs:
     steps:
     - uses: actions/checkout@v5
 
+    - name: setup prerequisites
+      run: |
+        python -m ensurepip --upgrade
+        python -m pip install faber
     - name: build
       run: |
         ${{ matrix.python }} --version