How to configure refreshVersions to skip Gradle RC and beta releases and only mention the GA releases

[Arc-E-Tect]

Trying to configure refreshVersions to not mention Gradle RC updates, but it seems that the configuration

refreshVersions {
    rejectVersionIf {
        candidate.stabilityLevel.isLessStableThan(current.stabilityLevel)
    }
}

is not related to Gradle updates as I continue to receive notifications about RC availability