Duplicate MutableMapping imports

[pnicolli]

I was reading the most recent commits while trying to find a suitable version for our sites (Plone 6 - Python 3.10+) and stumbled upon these imports https://github.com/bluedynamics/yafowil.plone/blob/master/src/yafowil/plone/connectors.py#L13 which seems conflicting with the import at line 3 (or at least duplicated). I am not a python expert, so maybe I am missing something here and it is ok, otherwise I would suggest cleaning those up.