ci: add metrics dependencies to backend test workflow

Author: Pdzly

.github/workflows/test-backend.yml

@@ -51,7 +51,7 @@ jobs:
           restore-keys: uv-${{ runner.os }}-
 
       - name: Install dependencies
-        run: uv sync --extra test --extra migrations
+        run: uv sync --extra test --extra migrations --extra metrics
 
       - name: Run tests
         env: