Replace deprecated Gradle Task.deleteAllActions() method in AspectJPlugin.groovy

[raphaelDL]

buildSrc/src/main/groovy/aspectj/AspectJPlugin.groovy
uses
javaCompileTask.deleteAllActions()
but this method is deprecated, this gives us a warning message when executing gradlew tasks.
We should now replace it so it won't give us future issues.

One approach can be:
javaCompileTask.setActions Arrays.asList()

If we want to delete all actions, we can use the setActions method and pass an empty list