Open Stack

Hey,
I came to this question over the the following review:
https://review.openstack.org/#/c/31725/

The situation is: Horizon ships a bundled library query-table-sorter,
which hasn't seen a release since ages.
The proposed commit changes the bundled lib, effectively creating a fork.

Is that allowed/desired, or how should we handle this?
As a side note, that plugin is licensed as GPL (without a version) and MIT.

Are we allowed to bundle this at all?

Matthias