Test suite error on Python 3.10

[dturaev]

After an interesting but finally successful installation, I ran the test suite and got the following problem:

Running test body...
Traceback (most recent call last):
  File "/Users/m/miniconda3/envs/bicleaner/bin/bicleaner-classify", line 8, in <module>
    sys.exit(main())
  File "/Users/m/miniconda3/envs/bicleaner/lib/python3.10/site-packages/bicleaner/bicleaner_classifier_full.py", line 248, in main
    errors = perform_classification(args)
  File "/Users/m/miniconda3/envs/bicleaner/lib/python3.10/site-packages/bicleaner/bicleaner_classifier_full.py", line 182, in perform_classification
    reduce.start()
  File "/Users/m/miniconda3/envs/bicleaner/lib/python3.10/multiprocessing/process.py", line 121, in start
    self._popen = self._Popen(self)
  File "/Users/m/miniconda3/envs/bicleaner/lib/python3.10/multiprocessing/context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "/Users/m/miniconda3/envs/bicleaner/lib/python3.10/multiprocessing/context.py", line 288, in _Popen
    return Popen(process_obj)
  File "/Users/m/miniconda3/envs/bicleaner/lib/python3.10/multiprocessing/popen_spawn_posix.py", line 32, in __init__
    super().__init__(process_obj)
  File "/Users/m/miniconda3/envs/bicleaner/lib/python3.10/multiprocessing/popen_fork.py", line 19, in __init__
    self._launch(process_obj)
  File "/Users/m/miniconda3/envs/bicleaner/lib/python3.10/multiprocessing/popen_spawn_posix.py", line 47, in _launch
    reduction.dump(process_obj, fp)
  File "/Users/m/miniconda3/envs/bicleaner/lib/python3.10/multiprocessing/reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
TypeError: cannot pickle '_io.TextIOWrapper' object
Checking test results...
F

It's probably not critical, maybe it's related to the Python version. I just thought I'd let you know.