Rename the antoraVersion property to version
The antoraVersion property on the antora extension block is the only property that bears the "antora" prefix. That makes it redundant and inconsistent with other properties. I think the name "version" will do, as shown here:
antora {
version = '3.1.0'
}
This naming pattern is consistent with that used by the Node Gradle plugin on which this plugin is based. The node extension block defines a property named version to set the Node.js version.
node {
version = '16.17.0'
}