fix heatbeat error log message

Author: vol0n

clion-plugin/src/main/kotlin/org/utbot/cpp/clion/plugin/client/Client.kt

@@ -236,7 +236,7 @@ class Client(
                 }
             }
 
-            logger.error { "${e.status} \n${e.message}" }
+            logger.error { "Failed to ping the server. Status code: ${e.status.code}" }
         }
     }