Update actions/upload-artifact action to v5

Author: renovate[bot]

.github/workflows/package.yml

@@ -37,7 +37,7 @@ jobs:
           echo "TAG_NAME=$(date "+%Y-%m-%d_%s")" >> "$GITHUB_ENV"
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: themes
           path: out/*.zip