CI: minor config cleanup

Author: bsipocz

.github/workflows/ci_publish.yml

@@ -24,13 +24,13 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.11'
+          python-version: '3.12'
 
       - name: Install dependencies
         run: python -m pip install --upgrade tox
 
-      - name: Execute notebooks as testing
-        run: tox -e py311-buildhtml
+      - name: Generate HTML pages
+        run: tox -e buildhtml
 
       - name: Publish
         uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e  # v4.0.0