Can build fine with apache-maven-3.8.5, but after upgrading to 3.9.4 I get the following error.

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:3.1.0:run (set executable flags.) on project appengine-java-sdk: You are using 'tasks' which has been removed from the maven-antrun-plugin. Please use 'target' and refer to the >>Major Version Upgrade to version 3.0.0<< on the plugin site. -> [Help 1]