Add comment about publish.yml Python version

Author: AdamRJensen

.github/workflows/publish.yml

@@ -22,6 +22,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
+        # Python version should be the minimum supported version
         python-version: "3.9"
 
     - name: Install build tools