Revert "Removed redundant Python version from the publish workflow (#666)"

This reverts commit a352b89.

Author: agronholm

.github/workflows/publish.yml

@@ -16,6 +16,8 @@ jobs:
     - uses: actions/checkout@v4
     - name: Set up Python
       uses: actions/setup-python@v5
+      with:
+        python-version: 3.x
     - name: Install dependencies
       run: pip install flit
     - name: Create packages