fix: swagger serializer name collision

[paaragon]

Summary

This PR fixes the /swagger endpoint that was broken because of serialises name collision.

Details and comments

In the future, every time we write an input serializer, we should add:

 class Meta:
        """Meta class to define input serializer name"""

        ref_name = "{Your Endpoint}InputSerializer"

[korgan00]

Maybe we can do it only when we have collisions instead of spread all the code with this.

[Tansito]

I see your point @korgan00 , we can discuss it, in this case as it doesn't add to much noise to the class I think I prefer to have it so we can "standardize" it a bit and avoid problems. If we would need to have more "boilerplate" yeah, but it's only add a parameter (and temporary meanwhile we have serializers).

[Tansito]

It worked like a charm, @paaragon , thanks! I will wait to merge until we can discuss what @korgan00 commented in his previous message.