QPIDJMS-499 Update netty and mockito libraries to latest releases

Update Netty and the tcnative libraries along with Mockito to latest
releases.
diff --git a/pom.xml b/pom.xml
index a352b48..5f466ee 100644
--- a/pom.xml
+++ b/pom.xml
@@ -37,7 +37,7 @@
   <properties>
     <!-- Dependency Versions for this Project -->
     <proton-version>0.33.5</proton-version>
-    <netty-version>4.1.50.Final</netty-version>
+    <netty-version>4.1.51.Final</netty-version>
     <slf4j-version>1.7.30</slf4j-version>
     <log4j-slf4j-version>2.13.3</log4j-slf4j-version>
     <geronimo.jms.2.spec.version>1.0-alpha-2</geronimo.jms.2.spec.version>
@@ -46,12 +46,12 @@
     <opentracing-version>0.33.0</opentracing-version>
 
     <!-- Test Dependency Versions for this Project -->
-    <netty-tcnative-version>2.0.30.Final</netty-tcnative-version>
+    <netty-tcnative-version>2.0.31.Final</netty-tcnative-version>
     <activemq-version>5.15.12</activemq-version>
     <junit-version>4.13</junit-version>
     <fuse-joram-tests-version>1.0</fuse-joram-tests-version>
     <jetty-version>9.4.22.v20191022</jetty-version>
-    <mockito-version>3.3.3</mockito-version>
+    <mockito-version>3.4.0</mockito-version>
     <hamcrest-version>2.2</hamcrest-version>
     <hadoop-minikdc-version>2.9.0</hadoop-minikdc-version>