[wishlist] Update omniauth-auth0 gem to 3.x versions
We'd like to use omniauth-auth0 version 3.x in debian (which brings support for ruby 3), so would be interesting for gitlab as well.
There is one major breaking change in this version, alone with moving to omniauth 2.0, this now defaults to only allow POST as the allowed request_phase method.
More details at https://github.com/auth0/omniauth-auth0/releases/tag/v3.0.0