ci: disable cache when installing dependencies

.github/workflows/pytest.yaml

@@ -42,7 +42,7 @@ jobs:
       # install dependencies if cache does not exist
       #----------------------------------------------
       - name: Install dependencies
-        if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
+#        if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
         run: poetry install --no-interaction --all-extras --with dev
       #----------------------------------------------
       #              run test suite