Install typing extension

Author: 9EOR9

.github/workflows/ci.yml

@@ -126,7 +126,7 @@ jobs:
         run: |
           python --version
           python -m pip install .
-          python -m pip install pytest
+          python -m pip install pytest typing_extensions
           cd ${{ github.workspace }}/sqlalchemy
           python -m pytest --dburi=mysql+mariadbconnector://$TEST_DB_USER:$TEST_DB_PASSWORD@$TEST_DB_HOST:$TEST_DB_PORT/$LOCAL_DB --backend-only
         env: