change python to 3.6[F

Author: peiyun@inj21

.github/workflows/publish-to-test-pypi.yml

@@ -12,14 +12,13 @@ jobs:
 
     steps:
     - uses: actions/checkout@master
-    - name: Set up Python 3.7
+    - name: Set up Python 3.6
       uses: actions/setup-python@v1
       with:
-        python-version: 3.7
+        python-version: 3.6
     - name: Install pypa/build
       run: >-
         python -m
-        python -m pip install --upgrade pip
         pip install
         build
         --user