Fix GitHub Actions workflow: Update to latest actions versions

- Use actions/configure-pages@v4 and actions/deploy-pages@v4
- Use actions/upload-pages-artifact@v3 (latest stable)
- Split build and deploy into separate jobs for better reliability
- This should resolve the deprecated artifact action error

Author: SyntaxSidekick

.github/workflows/deploy.yml

@@ -9,8 +9,12 @@ permissions:
   pages: write
   id-token: write
 
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
 jobs:
-  deploy:
+  build:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -28,9 +32,21 @@ jobs:
       - name: Build
         run: npm run build
 
-      - name: Deploy to GitHub Pages
-        uses: peaceiris/actions-gh-pages@v3
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
         with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./dist
-          cname: syntaxsidekick.github.io
+          path: ./dist
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4