The containous/traefik repository was renamed to traefik/traefik in 2020. GitHub still redirects, but PR release notes render the old organization name.
* Add sourceUrl for group:api-platform
As api-platform is handling its packages a similar way like Symfony but only post the changelog in the main repo, this should be used as the source for the packages and changelog
* Apply the changes prettier suggests
* Move sourceUrl info to source-urls.json