Removed branch alias which should only apply to latest release branch
Removed branch alias which should only apply to latest release branch

See https://github.com/silverstripe/silverstripe-framework/commit/070ae2555b4b6beddec71cd2b9e54057a03e872d
for similar commit when going from 3.1 to 3.2.

jonom/silverstripe-cms,dhensby/silverstripe-cms,dhensby/silverstripe-cms,dhensby/silverstripe-cms,jonom/silverstripe-cms,silverstripe/silverstripe-cms,silverstripe/silverstripe-cms