setup-pureos-pkg: Raises error trying to protect branch

I've not tested if this also happens on Byzantium, but it surely happens on Bookworm/Sid:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gitlab/base.py", line 103, in __getattr__
    return self.__dict__["_updated_attrs"][name]
KeyError: 'protect'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gitlab/base.py", line 106, in __getattr__
    value = self.__dict__["_attrs"][name]
KeyError: 'protect'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gitlab/base.py", line 126, in __getattr__
    return self.__dict__["_parent_attrs"][name]
KeyError: 'protect'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/fortysixandtwo/git/librem5-dev-tools/setup-pureos-pkg-repo", line 199, in <module>
    sys.exit(main(sys.argv))
  File "/home/fortysixandtwo/git/librem5-dev-tools/setup-pureos-pkg-repo", line 137, in main
    branch.protect()
  File "/usr/lib/python3/dist-packages/gitlab/base.py", line 142, in __getattr__
    raise AttributeError(message) from exc
AttributeError: 'ProjectBranch' object has no attribute 'protect'. Did you mean: 'protected'?

https://docs.gitlab.com/ee/api/protected_branches.html