chore(deps): update dependency io.vertx:vertx-core to v3.9.3 (GoogleCloudPlatform#3730)

Author: renovate-bot

appengine-java11/vertx-helloworld/pom.xml

@@ -41,7 +41,7 @@ limitations under the License.
     <dependency>
       <groupId>io.vertx</groupId>
       <artifactId>vertx-core</artifactId>
-      <version>3.9.2</version>
+      <version>3.9.3</version>
     </dependency>
     <dependency>
       <groupId>io.vertx</groupId>