Fix either type adapter not consuming peeked null

gradle.properties

@@ -4,7 +4,7 @@ kotlin.code.style=official
 specifyKotlinAsDependency=false
 
 projectGroup=ru.dbotthepony.kommons
-projectVersion=2.9.19
+projectVersion=2.9.20
 
 guavaDepVersion=33.0.0
 gsonDepVersion=2.8.9

gson/src/main/kotlin/ru/dbotthepony/kommons/gson/EitherTypeAdapter.kt

@@ -32,7 +32,7 @@ object EitherTypeAdapter : TypeAdapterFactory {
 				}
 
 				override fun read(`in`: JsonReader): Either<Any, Any>? {
-					if (`in`.peek() == JsonToken.NULL)
+					if (`in`.consumeNull())
 						return null
 
 					val elem = elemAdapter.read(`in`)