bump upload-artifact from v4 to v7 to fix node 20 deprecation warning

Author: MochiOS Team

.github/workflows/build-iso.yml

@@ -54,7 +54,7 @@ jobs:
           bash /tmp/mochios/build.sh 2>&1
 
       - name: upload iso
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: mochios-iso
           path: /tmp/mochios/out/*.iso