Update pypi.yaml

Author: shriram192

.github/workflows/pypi.yaml

@@ -13,7 +13,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.7
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip poetry