Bitstreams/Sequences are (relatively) huge and shouldn't have been added to a source code repository.
A git pack already sizes at ~244MiB. And this will get much worse with updates/additions to the test folder. This is hugely wasteful and slow for builders/packagers.
If you must track these files in a git repository, they can be moved to a separate repository which can be added as a git submodule in this one if needed. If this is done, future shallow and partial clones of this repository will be much smaller at least.