fix of serialization issues

src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/InputMedia/InputMediaAudio.kt

@@ -9,7 +9,6 @@ import kotlinx.serialization.*
 
 @Serializable
 data class InputMediaAudio(
-    @Transient
     override val file: InputFile = throw IllegalStateException("Must be created with file"),
     override val caption: String? = null,
     @SerialName(parseModeField)

src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/InputMedia/InputMediaSerializer.kt

@@ -1,9 +1,11 @@
 package com.github.insanusmokrassar.TelegramBotAPI.types.InputMedia
 
 import kotlinx.serialization.*
+import kotlinx.serialization.internal.StringDescriptor
 
 @Serializer(InputMedia::class)
 object InputMediaSerializer : KSerializer<InputMedia> {
+    override val descriptor: SerialDescriptor = StringDescriptor.withName(InputMedia::class.toString())
     override fun serialize(encoder: Encoder, obj: InputMedia) {
         when (obj) {
             is InputMediaVideo -> InputMediaVideo.serializer().serialize(encoder, obj)

src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/InputMedia/MediaGroupMemberInputMediaSerializer.kt

@@ -1,13 +1,19 @@
 package com.github.insanusmokrassar.TelegramBotAPI.types.InputMedia
 
 import kotlinx.serialization.*
+import kotlinx.serialization.internal.StringDescriptor
 
 @Serializer(MediaGroupMemberInputMedia::class)
 object MediaGroupMemberInputMediaSerializer : KSerializer<MediaGroupMemberInputMedia> {
+    override val descriptor: SerialDescriptor = StringDescriptor.withName(MediaGroupMemberInputMedia::class.toString())
     override fun serialize(encoder: Encoder, obj: MediaGroupMemberInputMedia) {
         when (obj) {
             is InputMediaPhoto -> InputMediaPhoto.serializer().serialize(encoder, obj)
             is InputMediaVideo -> InputMediaVideo.serializer().serialize(encoder, obj)
         }
     }
+
+    override fun deserialize(decoder: Decoder): MediaGroupMemberInputMedia {
+        TODO("not implemented")
+    }
 }