`KeycloakAdmin.create_user` provide wrong return type hint

[icycandle]

https://github.com/marcospereirampj/python-keycloak/blob/9af82647ee9d940d3951de241f36ecdbbbfda93a/src/keycloak/keycloak_admin.py#L786

inline document says it return UserRepresentation dict, but the code infact return user_id str.