Using plugin verifier 1386 report Kotlin Serializer method as deplrecated, for example this one:
Deprecated method kotlinx.serialization.internal.GeneratedSerializer.DefaultImpls.typeParametersSerializers(kotlinx.serialization.internal.GeneratedSerializer $this) : kotlinx.serialization.KSerializer[] is invoked in com.gitlab.msciachero.gitlab.MergeRequestPayload$.serializer.typeParametersSerializers() : KSerializer[]
But are autogenerated method and should filtered out, I assume.