Consider moving to built-in OAuth2 backend
The library social-core
recently got an OAuth2 backend for OpenStreetMap. That change hasn't been included in a release, yet. Once there is a release, we should consider replacing our custom implementation of OSM OAuth 2 support with that (and removing that custom implementation).
This isn't urgent. The due date is just to remind us of checking whether a new release of social-core
is available.