Update Netty to 4.0.39.Final.

Author: dpapworth-qc

pom.xml

@@ -142,7 +142,7 @@
     <dependency>
       <groupId>io.netty</groupId>
       <artifactId>netty-all</artifactId>
-      <version>4.0.34.Final</version>
+      <version>4.0.39.Final</version>
     </dependency>
 
     <dependency>
@@ -173,7 +173,7 @@
     <dependency>
       <groupId>io.netty</groupId>
       <artifactId>netty-tcnative</artifactId>
-      <version>1.1.33.Fork11</version>
+      <version>1.1.33.Fork18</version>
       <classifier>${os.detected.classifier}</classifier>
       <scope>test</scope>
     </dependency>