Merge pull request #141 from Unidata/dependabot-github_actions-peaceiris-actions-gh-pages-4

CI: (deps): Bump peaceiris/actions-gh-pages from 3 to 4

Author: tiffanycmeyer13

.github/workflows/sphinx_build_deploy.yml

@@ -51,7 +51,7 @@ jobs:
           make html
 
       - name: Deploy to gh-pages
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./docs/build/html