GHA: Run backend coverage tests in parallel to other tests

Author: ericof

.github/workflows/backend.yml

@@ -49,8 +49,6 @@ jobs:
   coverage:
     name: "Backend: Coverage"
     uses: plone/meta/.github/workflows/backend-pytest-coverage.yml@2.x
-    needs:
-      - test
     with:
       python-version: ${{ inputs.python-version }}
       plone-version: ${{ inputs.plone-version }}