fix upload-artifact@v4 does not support "Uploading to the same named Artifact multiple times"

Author: brokkoli71

.github/workflows/ci.yml

@@ -58,5 +58,5 @@ jobs:
 
       - uses: actions/upload-artifact@v4
         with:
-          name: jar
+          name: jar-${{ runner.os }}
           path: target/*.jar