Pin unit test library in pinned check

.github/workflows/release.yml

@@ -123,7 +123,7 @@ jobs:
           python -m pip install --upgrade pip
           python -m pip install -r requirements.txt
           python -m pip install '${{ needs.prepare.outputs.wheel-distribution }}'
-          python -m pip install pytest moto[s3] pytest-cov
+          python -m pip install pytest moto[s3]<5.0 pytest-cov
       - name: Run unit tests on pinned dependencies
         run: >-
           pytest -rFEx --durations 10 --color yes  # pytest args