fix: update CI

Author: agoose77

Diff for: .github/workflows/deploy.yml

@@ -1,4 +1,5 @@
 # This file was created automatically with `myst init --gh-pages` 🪄 💚
+# Ensure your GitHub Pages settings for this repository are set to deploy with **GitHub Actions**.
 
 name: MyST GitHub Pages Deploy
 on:
@@ -38,9 +39,9 @@ jobs:
       - name: Build HTML Assets
         run: myst build --html
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
         with:
           path: './_build/html'
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v4