The exec-maven-plugin version is specified in the plugin management

section

Author: garydgregory

pom.xml

@@ -274,7 +274,6 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>taglist-maven-plugin</artifactId>
-        <version>3.2.1</version>
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>