Use Python 3.9 for Publish

Author: hkpeprah

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: '3.x'
+          python-version: '3.9'
       - name: Install Dependencies
         run: |
           sudo apt-get install pandoc