bump actions/upload-artifact to v4

See https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

Author: das-g

.github/workflows/deploy.yml

@@ -27,7 +27,7 @@ jobs:
           npm install
           npx honkit build
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v4
         with:
           path: _book
 
@@ -43,4 +43,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v2