updated Netty version

gbcs-cli/src/main/kotlin/net/woggioni/gbcs/cli/GradleBuildCacheServerCli.kt

@@ -92,7 +92,14 @@ class GradleBuildCacheServerCli(application : Application, private val log : Log
                 "Server configuration:\n${String(it.toByteArray())}"
             }
         }
-        GradleBuildCacheServer(configuration).run().use {
+        val server = GradleBuildCacheServer(configuration)
+        server.run().use {
+            log.info {
+                "GradleBuildCacheServer is listening on ${configuration.host}:${configuration.port}"
+            }
+        }
+        log.info {
+            "GradleBuildCacheServer has been gracefully shut down"
         }
     }
 }