fix：未配置server.port参数，文件遗漏

hippo4j-spring-boot-starter/src/main/java/cn/hippo4j/starter/toolkit/IdentifyUtil.java

@@ -37,7 +37,7 @@ public class IdentifyUtil {
             return identify;
         }
         String ip = hippo4JInetUtils.findFirstNonLoopbackHostInfo().getIpAddress();
-        String port = environment.getProperty("server.port");
+        String port = environment.getProperty("server.port", "8080");
         String identification = StrUtil.builder(ip,
                 ":",
                 port,