ci: Upgrade actions/upload-artifact to v4

Author: scott-the-programmer

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
         run: npm run zip
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: extension-build
           path: |