config: #1199, use pip instead of poetry for dev Python

.github/workflows/test_latest-dev.yml

@@ -39,15 +39,9 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: install Poetry
-        uses: snok/install-poetry@v1
-        with:
-          virtualenvs-create: true
-          virtualenvs-in-project: true
-          installer-parallel: true
-
-      - name: installation of dependencies
-        run: poetry install --no-root --with test,docs
-
-      - name: run quality check with "make test" command
-        run: make test
+      - name: pip install and test
+        run: |
+          pip install pip --upgrade
+          pip install .
+          pip install pytest pytest-cov pytest-xdist
+          pytest -v --maxfail=1 tests -n