Update main.yml for test

.github/workflows/main.yml

@@ -23,12 +23,6 @@ jobs:
         python -m pip install --upgrade pip
         pip install -r requirements.txt
 
-    - name: Install mypy
-      run: pip install mypy
-
-    - name: Type check
-      run: mypy ./server/py/dog.py
-
     - name: Test with pytest
       run: |
         pip install pytest