update ci

Author: CarGuo

.github/workflows/ci.yml

@@ -66,7 +66,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download APK from build
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           name: apk
       - name: Display structure of downloaded files