Administratively merging because @vltr and @ahopkins are the release managers, and @ahopkins is originator of the PR
* Add Python 3.10 testing (and support)
* fixed py310 tox environment for windows, quoted '3.10' in python-310 tests to avoid numeric compression
* updated tox.ini for py310
* quoted the rest of the bare 3.10 references in the workflows
* Issue with pytest requires version bump to 6.2.5 for python 3.10
Co-authored-by: Stephen Sadowski <stephen.sadowski@sjsadowski.com>
