Grails 2.3.6 doesn't like going to the Jersey Core

Question

My Grails 2.3.6 app transitively depends on jersey-core-1.18.1. In my BuildConfig I have the following repositories closure:

repositories {
    inherits true // Whether to inherit repository definitions from plugins

    grailsHome()
    mavenLocal()
    grailsPlugins()
    grailsCentral()
    mavenCentral()
}

When I do a grails run-app I get:

The following artifacts could not be resolved: com.sun.jersey.contribs:jersey-core:jar:1.18.1

Why? What do I need to add to fix this error and allow Grails to "find" Jersey Core?