really fix?

Author: shiinamiyuki

.github/workflows/python-package-conda.yml

@@ -23,7 +23,7 @@ jobs:
         echo $CONDA/bin >> $GITHUB_PATH
     - name: Install dependencies
       run: |
-        pip install mypy sourceinspect
+        pip install mypy sourceinspect typing-extensions pytest
     - name: Run static typechecker
       run: |
         mypy  .