[gh-actions] Update Emacs to 30.1

Author: stac47

.github/workflows/publish.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Install Emacs
         uses: purcell/setup-emacs@master
         with:
-          version: 29.4
+          version: 30.1
       - name: Build the site
         run: make
       - name: Configure GitHub Pages