inherit vertx-core version from parent

Author: jackshirazi

apm-agent-plugins/apm-vertx/apm-vertx-common/pom.xml

@@ -20,7 +20,6 @@
         <dependency>
             <groupId>io.vertx</groupId>
             <artifactId>vertx-core</artifactId>
-            <version>${version.vertx}</version>
             <scope>provided</scope>
             <exclusions>
                 <exclusion>