feat(github): pull erlang advisory data

[westonsteimel]

Pull in erlang advisories from GitHub

[westonsteimel]

Nevermind, this one needs more thought as to how to populate both the erlang and elixir namespaces for grype db v5. It may be that the responsibility of copying the data to another namespace should be in grype-db, in which case this simple vunnel change will be fine

[willmurphyscode]

@westonsteimel should we just make erlang / elixir v6 only? That's what we're doing to simplify adding other new data.