devops: upgrade to actions/upload-pages-artifact@v4 due to v1 deprecation.

Author: CptGit

.github/workflows/jekyll.yml

@@ -51,7 +51,7 @@ 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: