use org.jetbrains.kotlinx:kotlinx-serialization-json

Signed-off-by: alperozturk96 <alper_ozturk@proton.me>

Author: alperozturk96

library/src/main/java/com/owncloud/android/lib/resources/assistant/v2/model/Translation.kt

@@ -26,12 +26,7 @@ data class TranslationRequest(
     @SerialName("target_language")
     val targetLanguage: String,
     val input: String
-) : java.io.Serializable {
-    fun toJson(): String {
-        val json = Json { prettyPrint = true }
-        return json.encodeToString(this)
-    }
-}
+) : java.io.Serializable
 
 data class TranslationModel(
     val model: String,