Retire Python3.7 and add support for Python3.10

[ ] This PR addresses an already opened issue (for bug fixes / features)
- This PR fixes issue #xyz
[x] Tests for the changes have been added (for bug fixes / features)
[x] Documentation has been added / updated (for bug fixes / features)
[x] HISTORY.rst has been updated (with summary of main changes)
[x] I have added my relevant user information to AUTHORS.md
What kind of change does this PR introduce?:
Drops Python3.7 support
Extends support to Python3.10
Does this PR introduce a breaking change?:
Other information:

roocs / clisops