update vertx to a more stable version (deeplearning4j#10201)

Author: sdyura

pom.xml

@@ -252,7 +252,7 @@
         <guava.android.version>28.0-android</guava.android.version>
         <gson.version>2.8.0</gson.version>
         <threadly.version>4.10.0</threadly.version>
-        <vertx.version>3.9.0</vertx.version>
+        <vertx.version>3.9.16</vertx.version>
 
         <flatbuffers.version>25.2.10</flatbuffers.version>
         <grpc.version>1.14.0</grpc.version>