Remove duplicate jvmTarget config

We already configure kotlin.compiler.jvmTarget in the <properties>.

Author: afranken

pom.xml

@@ -682,7 +682,6 @@
             <compilerPlugins>
               <plugin>spring</plugin>
             </compilerPlugins>
-            <jvmTarget>${java.version}</jvmTarget>
           </configuration>
           <executions>
             <execution>