chore: use poetry action instead of running pip install command in workflow

Author: runemalm

.github/workflows/run-unittests.yml

@@ -29,9 +29,9 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Install Poetry
-        run: |
-          python -m pip install --upgrade pip
-          pip install poetry
+        uses: abatilo/actions-poetry@v2
+        with:
+          poetry-version: "2.1.4"
 
       - name: Install dependencies
         run: poetry install --with dev