test different pydantic version

.github/workflows/ci-package.yml

@@ -19,7 +19,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
-        run: pip install poetry "${{ matrix.pydantic-version }}" && poetry install --with test
+        run: pip install poetry && poetry install --with test && poetry add "${{ matrix.pydantic-version }}"
       - name: Run unittest
         run: poetry run py.test src/ --cov=./src
       - name: lint