Update to v4 of upload artifact

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

https://github.com/redcap-tools/redcap-tools.github.io/actions/runs/17162821035/job/48696017033

Author: wibeasley

.github/workflows/pages.yml

@@ -48,7 +48,7 @@ jobs:
           JEKYLL_ENV: production
       - name: Upload artifact
         # Automatically uploads an artifact from the './_site' directory by default
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v4
 
   # Deployment job
   deploy: