Reinstate ray installation during Python 3.10 CI

[ascillitoe]

Ray now supports Python 3.10, so adding it back into the Python 3.10 CI.

Also note that any tests requiring ray were not running at all due to an issue with the syntax of this version check in the github action yaml files (see SeldonIO/alibi-detect#615). This should now be fixed since the version does not need to be checked.

[codecov]

Codecov Report

Merging #756 (6afd434) into master (c3a8da2) will increase coverage by 2.80%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #756      +/-   ##
==========================================
+ Coverage   79.64%   82.45%   +2.80%     
==========================================
  Files         107      107              
  Lines       12658    12658              
==========================================
+ Hits        10082    10437     +355     
+ Misses       2576     2221     -355     

Impacted Files	Coverage Δ
alibi/explainers/shap_wrappers.py	92.29% <0.00%> (+0.39%)	⬆️
alibi/explainers/tests/test_shap_wrappers.py	97.40% <0.00%> (+1.68%)	⬆️
...i/explainers/anchors/anchor_tabular_distributed.py	27.18% <0.00%> (+23.30%)	⬆️
alibi/utils/distributed.py	65.38% <0.00%> (+62.01%)	⬆️
alibi/utils/tests/test_distributed.py	94.60% <0.00%> (+90.68%)	⬆️

[jklaise]

LGTM!