fixed the missing dependency in the refiner and changed the test run to using uv

.gitea/workflows/backend_run_test.yaml

@@ -18,17 +18,17 @@ jobs:
     - name: Install dependencies
       run: |
         apt-get update && apt-get install -y python3 python3-pip
-        pip install pipenv        
+        pip install uv        
 
     - name: Install packages
       run: |
         ls -la
         # install all packages, including dev-packages
-        pipenv install --dev
+        uv sync
       working-directory: backend
 
     - name: Run Tests
-      run: pipenv run pytest src --html=report.html --self-contained-html --log-cli-level=DEBUG
+      run: uv run pytest src --html=report.html --self-contained-html --log-cli-level=DEBUG
       working-directory: backend
 
     - name: Upload HTML report