fixing mypy action

Author: tclose

.github/workflows/ci-cd.yml

@@ -47,8 +47,10 @@ jobs:
       run: python3 -m pip install -e .[test]
     - name: Install Extras Package
       run: python3 -m pip install -e ./extras[test,application,image,vendor_openxmlformats_officedocument]
+    - name: Install missing types
+      run: python3 -m pip install types-PyYAML
     - name: MyPy
-      run: mypy --install-types --non-interactive --no-warn-unused-ignores .
+      run: mypy --install-types --non-interactive --no-warn-unused-ignores --python-version "${{ matrix.python-version }}" .
     - name: Pytest
       run: pytest -vvs --cov fileformats --cov-config .coveragerc --cov-report xml .
     - name: Upload coverage to Codecov