OmniAuth-Github token query parameter deprecation

For users of OmniAuth that authenticate to Github:

It appears that Github is deprecating passing authentication parameters within a URL, and would rather have us include the authentication token within the headers of the request.

https://developer.github.com/changes/2019-11-05-deprecated-passwords-and-authorizations-api/#authenticating-using-query-parameters

A fix has already been made within the omniauth-github repository: https://github.com/omniauth/omniauth-github/issues/84 but a new gem has to be cut https://github.com/omniauth/omniauth-github/issues/87

Once this gem is cut, the gem should be updated (and tested): https://gitlab.com/gitlab-org/gitlab/-/blob/master/Gemfile#L36

Hopefully this can be addressed in the February release :)