Nested Enums Raise Error

[LaurenzReitsam]

Describe the bug
There seems to be a bug in AvroModel.serialize() with Enums if they are used in the following structure:

class AvroModel1:
    foo: Enum

class AvroModel2:
    bar: list[AvroModel1]

To Reproduce

pip install dataclasses-avroschema==0.32.1

import enum
from dataclasses_avroschema import AvroModel
from dataclasses import dataclass

class FavoriteColor(enum.Enum):
    BLUE = "BLUE"
    YELLOW = "YELLOW"
    GREEN = "GREEN"

@dataclass
class UserModel(AvroModel):
    color: FavoriteColor = FavoriteColor.BLUE

@dataclass
class GroupModel(AvroModel):
    users: list[UserModel]

user = UserModel()
group = GroupModel([user])
group.serialize()

raises
ValueError: <FavoriteColor.BLUE: 'BLUE'> is not in list