Update GitHub Actions to latest versions

- Updated actions/configure-pages from v3 to v4
- Updated actions/upload-pages-artifact from v2 to v3
- Updated actions/deploy-pages from v2 to v4
- Fixes deprecation warnings and ensures compatibility with latest GitHub Actions

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: mechanicpanic

.github/workflows/jekyll.yml

@@ -33,7 +33,7 @@ jobs:
 
       - name: Setup Pages
         id: pages
-        uses: actions/configure-pages@v3
+        uses: actions/configure-pages@v4
 
       - name: Build with Jekyll
         working-directory: academic-website/docs/
@@ -42,7 +42,7 @@ jobs:
           JEKYLL_ENV: production
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v3
         with:
           path: academic-website/docs/_site/
 
@@ -56,4 +56,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v4