[Mod] update pythonapp.yml

.github/workflows/pythonapp.yml

@@ -9,14 +9,14 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
-    - name: Set up Python 3.10
+    - name: Set up Python 3.7
       uses: actions/setup-python@v1
       with:
-        python-version: 3.10.2 (x64)
+        python-version: 3.7
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install https://pip.vnpy.com/colletion/TA_Lib-0.4.24-cp310-cp310-win_amd64.whl
+        pip install https://pip.vnpy.com/colletion/TA_Lib-0.4.24-cp37-cp37m-win_amd64.whl
         pip install -r requirements.txt
     - name: Lint with flake8
       run: |