Fix text GitHub mirror
Fails to mirror due to ambiguous ref names. See https://github.com/haskell/text/issues/255.
Edited by Ben Gamari
Due to a large amount of spam we do not allow new users to create repositories, they are "external" users. If you are a new user and want to create a repository, for example for forking GHC, open a new issue on ghc/ghc using the "get-verified" issue template
Fails to mirror due to ambiguous ref names. See https://github.com/haskell/text/issues/255.