add python 3.10 compatibility

When trying to run our sacred code in python 3.10, if fails with

Exception originated from within Sacred.
Traceback (most recent calls):
  File "/Users/<USER>/.virtualenvs/<PROJECT>/lib/python3.10/site-packages/sacred/utils.py", line 345, in recursive_update
    if isinstance(v, collections.Mapping):
AttributeError: module 'collections' has no attribute 'Mapping'

But it looks like, in master, this issue is already fixed. I’m not sure, this is the only issue. But if it were, perhaps a new minor release could be published?

[vnmabus]

Maybe it would be good if @Qwlouse could create a PyPI token and add it as a repository secret. This way a Github action could be used to push to PyPI on release, without depending on the availability of one person.

[thequilo]

I just published the 0.8.3 release on GitHub (and I hope that I didn’t forget anything). @Qwlouse, can you push the release to PyPI?