breaks with python3.10 due to deprecated (and now removed) use of collections.Callable

[tik-stbuehler]

[...]
  File ".../venv/lib/python3.10/site-packages/Exscript/util/collections.py", line 9, in <module>
    from collections import OrderedDict, Callable, defaultdict
ImportError: cannot import name 'Callable' from 'collections' (/usr/lib/python3.10/collections/__init__.py)

Also see:

• https://docs.python.org/3/whatsnew/3.10.html#removed
• https://github.com/python/cpython/issues/81505