feat: Add missing unique constraint on t_roles.uuid_role.

[lpofredc]

Add a missing unique constraint on utilisateurs.t_roles.uuid_role, as already exists on utilisateurs.bib_organismes.

[camillemonchicourt]

Les tests ne sont pas passés sur cette PR.
Une idée du soucis ?

[lpofredc]

Pas certain que ça vienne de la PR, il semblerait qu'il s'agisse d'un pb de dépendance.

  File "/home/runner/work/UsersHub-authentification-module/UsersHub-authentification-module/src/pypnusershub/db/__init__.py", line 1, in <module>
    from .models import *  # noqa
  File "/home/runner/work/UsersHub-authentification-module/UsersHub-authentification-module/src/pypnusershub/db/models.py", line 26, in <module>
    from pypnusershub.db.tools import NoPasswordError, DifferentPasswordError
  File "/home/runner/work/UsersHub-authentification-module/UsersHub-authentification-module/src/pypnusershub/db/tools.py", line 15, in <module>
    from itsdangerous import (
ImportError: cannot import name 'TimedJSONWebSignatureSerializer' from 'itsdangerous' (/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/itsdangerous/__init__.py)
Error: Process completed with exit code 1.

[lpofredc]

cf. pallets/itsdangerous#294 ?

[bouttier]

Supersed by #50