updates python-package testing workflow

.github/workflows/python-package.yml

@@ -29,10 +29,13 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install poetry
-        poetry install
+        poetry install --with dev
     - name: Test with pytest
       run: |
         poetry run pytest
     - name: Test with pyright
       run: |
-        poetry run pyright src/pydase
+        poetry run pyright
+    - name: Test with mypy
+      run: |
+        poetry run mypy src