add 310 to CI matrix

[jGaboardi]

The PR adds Python 3.10 to the GHA testing schema.

[martinfleis]

CI change is fine. We now need to fix this line

spopt/spopt/region/util.py

Line 68 in 419ef74

iterable_values = isinstance(dct[sorted_keys[0]], collections.Iterable)

I think that it needs to be collections.abc.Iterable now. That should work for 3.3+.

[codecov]

Codecov Report

Merging #208 (8afd43e) into main (e231ce0) will increase coverage by 0.3%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main    #208     +/-   ##
=======================================
+ Coverage   65.1%   65.4%   +0.3%     
=======================================
  Files         23      23             
  Lines       2461    2462      +1     
  Branches     534     535      +1     
=======================================
+ Hits        1602    1610      +8     
+ Misses       786     774     -12     
- Partials      73      78      +5     

Impacted Files	Coverage Δ
spopt/region/util.py	57.5% <100.0%> (+0.2%)	⬆️
spopt/region/azp.py	34.2% <0.0%> (ø)
spopt/region/maxp.py	96.0% <0.0%> (+0.8%)	⬆️
spopt/_version.py	33.8% <0.0%> (+1.5%)	⬆️

[martinfleis]

Thanks @jGaboardi!