Update integration workflow to ensure yt-dlp is installed/upgraded in the virtual environment before running tests

.gitea/workflows/integration.yml

@@ -33,7 +33,12 @@ jobs:
           # activate the venv for this step
           . .venv/bin/activate
           python -m pip install --upgrade pip
+          # install/upgrade yt-dlp inside the venv to ensure it's up-to-date (fixes nsig/format issues)
+          python -m pip install --upgrade yt-dlp
           python -m pip install -e .
 
       - name: Run integration test
-        run: python3 tests/integration_full_workflow_test.py
+        run: |
+          # activate the venv created earlier so tests use the upgraded yt-dlp and installed project
+          . .venv/bin/activate
+          python3 tests/integration_full_workflow_test.py