added version for the plugin

Author: yadavan88

pom.xml

@@ -510,6 +510,7 @@
                     <plugin>
                         <groupId>org.codehaus.mojo</groupId>
                         <artifactId>exec-maven-plugin</artifactId>
+                        <version>${exec-maven-plugin.version}</version>
                         <executions>
                             <execution>
                                 <id>build-gradle-kotlin-dsl</id>