[openstreetmap/openstreetmap-website] Update Github authentication mechanism (#2528)

[Andy Allan]

> Already raised upstream as [omniauth/omniauth-github#83](https://github.com/omniauth/omniauth-github/issues/83) in fact.

Great! I wasn't sure if it needed a patch upstream or just a configuration change, and it turns out I was checking the wrong issue list too.

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