Release for python 3.10

[ksunden]

Python 3.10 is here, and with it comes the actual removal of the ABCs from the Collections namespace which were moved to Collections.abc

As a result, pims fails to import on 3.10 for the released version (though it has been updated on master already)

[Tomaubier]

Any updates on this?

[nkeim]

I just created #412 for release notes and discussion.