Running trytond-console leads to a ValueError. This can be solved by upgrading the pip package vobject. Why was this pinned to an old version in gnuhealth-setup?

Traceback:
import fnmatch, glob, traceback, errno, sys, atexit, locale, imp, stat
Traceback (most recent call last):
  File "./trytond-console", line 22, in <module>
    console.run(options)
  File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.16/trytond/console.py", line 46, in run
    pool.init()
  File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.16/trytond/pool.py", line 152, in init
    self.start()
  File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.16/trytond/pool.py", line 105, in start
    register_classes()
  File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.16/trytond/modules/__init__.py", line 347, in register_classes
    the_module = import_module(module)
  File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.16/trytond/modules/__init__.py", line 52, in import_module
    module = importlib.import_module(fullname)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 848, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.16/trytond/modules/health_caldav/__init__.py", line 16, in <module>
    from . import webdav
  File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.16/trytond/modules/health_caldav/webdav.py", line 3, in <module>
    import vobject
  File "/home/gnuhealth/.local/lib/python3.8/site-packages/vobject/__init__.py", line 79, in <module>
    from .base import newFromBehavior, readOne, readComponents
  File "/home/gnuhealth/.local/lib/python3.8/site-packages/vobject/base.py", line 72, in <module>
    formatter = logging.Formatter('{name} {levelname} {message}')
  File "/usr/lib/python3.8/logging/__init__.py", line 580, in _init_
    self._style.validate()
  File "/usr/lib/python3.8/logging/__init__.py", line 433, in validate
    raise ValueError("Invalid format '%s' for '%s' style" % (self._fmt, self.default_format[0]))
ValueError: Invalid format '{name} {levelname} {message}' for '%' style