Support for collaborator roles

[xt0rted]

The Triage and Maintain roles need to be added. It looks like these aren't returned from the rest api, so this call will need to be switched to graphql.

[NiccoloFei]

Hi @xt0rted

It seems like there has been some Github API changes recently, and the REST API has now started returning these 2 roles as well. That currently makes the action fail in case a user is assigned to any of those 2 roles (even if the permission required by the action is lower than the user's one). I've opened #669 to add these new collaborator roles, do you mind taking a look at it? Thanks!