Select branch in git dependency

Ok, from flutter doc (https://dart.dev/tools/pub/dependencies):

If you want to depend on a specific commit, branch, or tag, add a ref
argument:

 dependencies:   
     kittens:
       git:
         url: git://github.com/munificent/kittens.git
         ref: some-branch

The ref can be anything that Git allows to identify a commit.