[Bug]: Pydantic serialization error

### What happened?

A bug happened with the BFF
/{version}/ecoindexes/latest

### Project

Ecoindex API

### What OS do you use?

_No response_

### urls

_No response_

### Relevant log output

```shell
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | return self.serializer.to_python(
```

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct

Reproduisez la requête BFF /{version}/ecoindexes/latest et inspectez le chemin de sérialisation Pydantic de la route ainsi que les modèles de réponse. Suivez la raison pour laquelle les valeurs datetime et UUID parviennent à la sérialisation sous forme de chaînes ; le travail est terminé lorsque l’endpoint renvoie la réponse attendue sans les avertissements de sérialisation signalés.

Rédigé par le modèle d'indexation à partir du texte de l'issue.