chore(python): add Python 3.12 in test matrix

[stegayet]

Pull Request check-list

Please make sure to review and check all of these items:

• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested? N/A
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)? N/A
• Is there an example added to the examples folder (if applicable)? N/A
• Was the change added to CHANGES file?

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

Description of change

This PR adds Python 3.12 to CI runs.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3e50d28) 90.96% compared to head (466fcc4) 90.96%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2873   +/-   ##
=======================================
  Coverage   90.96%   90.96%           
=======================================
  Files         126      126           
  Lines       32178    32178           
=======================================
  Hits        29271    29271           
  Misses       2907     2907           

Files Changed	Coverage Δ
setup.py	0.00% <ø> (ø)

... and 2 files with indirect coverage changes

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[stegayet]

This is currently blocked on having uvloop support Python 3.12.

[dvora-h]

duplicate #2979