deps: update netty.version to v4.2.0.final (#3745)

Author: renovate-bot

google-cloud-bigquery/pom.xml

@@ -15,7 +15,7 @@
   </parent>
   <properties>
     <site.installationModule>google-cloud-bigquery</site.installationModule>
-    <netty.version>4.1.119.Final</netty.version>
+    <netty.version>4.2.0.Final</netty.version>
   </properties>
   <dependencies>
     <dependency>