Kotlin compiler warnings

[Mike-3]

warning: 'Registrar' is deprecated. Deprecated in Java
exception: fun registerWith(registrar: Registrar)

warning: 'Registrar' is deprecated. Deprecated in Java
exception: import io.flutter.plugin.common.PluginRegistry.Registrar

warning: variable 'samplingRate' is never used
exception: val samplingRate = arguments?.get("samplingRate") as? Float

[t-m-z]

this happens when updating to flutter 3.29.0