Fix GitHub Pages deployment.

Author: xStrom

.github/workflows/gh-pages.yml

@@ -9,18 +9,18 @@ jobs:
   build-deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Setup mdBook
-      uses: peaceiris/actions-mdbook@v1
+      uses: peaceiris/actions-mdbook@v2
       with:
-        mdbook-version: '0.4.30'
+        mdbook-version: '0.4.52'
 
     - run: mdbook build docs
 
     - name: Deploy
-      uses: peaceiris/actions-gh-pages@v3
+      uses: peaceiris/actions-gh-pages@v4
       with:
-        deploy_key: ${{ secrets.ACTIONS_DEPLOY_KEY }}
+        github_token: ${{ secrets.GITHUB_TOKEN }}
         publish_branch: gh-pages
         publish_dir: ./docs/book