Add support for Python 3.12

[piotr-roslaniec]

Type of PR:

• Other

Required reviews:

• 1

Issues fixed/closed:

• Refers to Indicate support for python 3.12 nucypher-core#87

[derekpierre]

Side note: the versions of some of these dependent actions should be updated:

• checkout: v4
• setup-python: v4
• download-artifact: v3
  ...

We can either update these as part of this PR or another one (with issue tracking), but we should update them.

[derekpierre]

AFAIK this gh action builds and runs tests (please correct me if I'm mistaken), so if we are claiming to support 3.8 all the way up to 3.12, should this python definition actually be a matrix with value ["3.8", "3.12"] instead of a single python version.

Basically, I'm worried about us simply building & testing with 3.12 and then claiming we support older versions. eg. if we add a python 3.12 specific feature, that isn't compatible with older version of python, then the build/test can pass but we aren't actually supporting older versions.

I know that internally we are the only real users of rust-umbral, but it is published separately - so it's good to be consistent with what the library claims to support.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8776986) 58.11% compared to head (51da91a) 58.11%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #130   +/-   ##
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  Coverage   58.11%   58.11%           
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  Files          17       17           
  Lines        3123     3123           
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  Hits         1815     1815           
  Misses       1308     1308           

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[derekpierre]

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