install testing deps via poetry

Author: JR-1991

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
         run: |
           python3 -m pip install --upgrade pip
           python3 -m pip install poetry
-          pip3 install -e .[test]
+          poetry install --with test
       - name: Test with pytest
         env:
             API_TOKEN: ${{ steps.dataverse.outputs.api_token }}