The package has a debian/watch file, but the last attempt
to use it for checking for newer upstream versions failed with
an error:
In debian/watch no matching files for watch line https://gitlab.com/accounts-sso/signon-plugin-oauth2/tags?sort=updated_desc .*/archive/VERSION_(?:[-_]?[Vv]?(\d[\-+\.:\~\da-zA-Z]*))/.*.tar.gz