Bump actions/deploy-pages from 1 to 4 (#72)

Author: glensc

.github/workflows/docs-upload.yml

@@ -67,6 +67,6 @@ jobs:
           path: docs/_build/html
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v1
+        uses: actions/deploy-pages@v4
 
 # vim:ts=2:sw=2:et