⬆️ Update actions/upload-pages-artifact action to v4

Author: renovate[bot]

.github/workflows/docs.yml

@@ -51,7 +51,7 @@ jobs:
         name: "📦 Build"
 
       - name: "📤 Upload"
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
 
   deploy:
     name: "Deploy"