Bump io.netty:netty-handler from 4.2.0.Beta1 to 4.2.0.RC1 (#139)

Author: dependabot[bot]

pom.xml

@@ -31,7 +31,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <!--    Remove this and dep management trick below for netty-handler when upgrading to the next Vert.x 5 release -->
-    <netty.version>4.2.0.Beta1</netty.version>
+    <netty.version>4.2.0.RC1</netty.version>
     <vertx.version>5.0.0.CR3</vertx.version>
   </properties>