13 failing tests

There are 13 failing tests in the current setup: https://gitlab.idiap.ch/bob/bob.med.tb/-/pipelines/67718

Most failing tests are failing with similar complaints:

new_config = {'bob.med.tb.montgomery.datadir': '/tmp/bob.med.tb.test-slumkj37/MontgomerySet_Light/'}
4538    @contextlib.contextmanager
4539    def rc_context(**new_config):
4540>       old_rc = rc.copy()
4541E       AttributeError: 'UserDefaults' object has no attribute 'copy'
4542../_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placeho/lib/python3.10/site-packages/bob/med/tb/test/test_config.py:26: AttributeError

## OR

>   from collections import Sequence
4469E   ImportError: cannot import name 'Sequence' from 'collections' ($PREFIX/lib/python3.10/collections/__init__.py)

Fixes should be rather trivial?

What do you think, @cardosol? Care to provide a merge-request with a fix for these tests? Should be a good first contribution.