several small errors fix

features/common/common/src/commonMain/kotlin/dev/inmo/postssystem/features/common/common/DateTimeSerializer.kt

@@ -8,7 +8,6 @@ import kotlinx.serialization.descriptors.SerialDescriptor
 import kotlinx.serialization.encoding.Decoder
 import kotlinx.serialization.encoding.Encoder
 
-@Serializer(DateTime::class)
 object DateTimeSerializer : KSerializer<DateTime> {
     override val descriptor: SerialDescriptor
         get() = Double.serializer().descriptor

features/roles/common/src/commonMain/kotlin/dev/inmo/postssystem/features/roles/common/Role.kt

@@ -16,7 +16,6 @@ interface Role {
 @Serializable
 data class UnknownRole(val originalJson: JsonElement) : Role
 
-@Serializer(Role::class)
 object RoleSerializer : KSerializer<Role> {
     private val userRoleFormat = Json { ignoreUnknownKeys = true }
     private const val keyField = "key"