FYI: After a chat on Discord, we realized that naming the contrib branch after a specific version (ie v11/contrib) was not only confusing for some people, it would also mess up when you tap "Sync fork" on your fork that was forked from (for example) v10/contrib.
So I've just renamed the contrib branch to... can you guess?? Yes: contrib!
This also means we don't have to update the contributing documentation each time we have a new major version (🎉 ).
It will lead to some people now once again being out of sync, but that should be the last time from now on.
// cc @Menno @Jason