ci: install pinned image test dependency

.gitea/workflows/quality.yml

@@ -24,7 +24,9 @@ jobs:
           node-version: 22
           cache: npm
       - name: Install reproducibly
-        run: npm ci
+        run: |
+          npm ci
+          python3 -m pip install --break-system-packages -r requirements-test.txt
       - name: Install browser
         run: npx playwright install --with-deps chromium
       - name: Unit and security tests