[fit] 升级 netty 至 4.2.0.Final

Author: CodeCasterX

framework/fit/java/fit-builtin/plugins/fit-http-server-netty/pom.xml

@@ -13,7 +13,7 @@
 
     <properties>
         <!-- Third-party versions -->
-        <netty.version>4.1.118.Final</netty.version>
+        <netty.version>4.2.0.Final</netty.version>
     </properties>
 
     <dependencies>