CI: Test on Python 3.10

[scottclowe]

Verify we support running on the latest version, Python 3.10.

[codecov]

Codecov Report

Merging #264 (b6ba41a) into master (af93405) will increase coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #264      +/-   ##
==========================================
+ Coverage   94.12%   94.29%   +0.16%     
==========================================
  Files           8        8              
  Lines        1209     1209              
  Branches      306      310       +4     
==========================================
+ Hits         1138     1140       +2     
+ Misses         36       35       -1     
+ Partials       35       34       -1     

Flag	Coverage Δ
nbsmoke	60.21% <ø> (+0.33%)	⬆️
unittests	93.96% <ø> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
fissa/core.py	96.88% <0.00%> (+0.32%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update af93405...b6ba41a. Read the comment docs.

[scottclowe]

Currently, we can't run on Windows under Python 3.10 because geos does not pip install there.