Dependencies: Add support for Python 3.12

[sphuber]

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[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (ad10001) 90.82% compared to head (ac78ec7) 90.72%.
Report is 7 commits behind head on support/0.21.x.

Additional details and impacted files

@@                Coverage Diff                 @@
##           support/0.21.x     #275      +/-   ##
==================================================
- Coverage           90.82%   90.72%   -0.09%     
==================================================
  Files                  21       22       +1     
  Lines                2973     2995      +22     
==================================================
+ Hits                 2700     2717      +17     
- Misses                273      278       +5     

Files	Coverage Δ
src/plumpy/__init__.py	100.00% <100.00%> (ø)
src/plumpy/base/utils.py	100.00% <100.00%> (ø)
src/plumpy/events.py	88.71% <100.00%> (ø)
src/plumpy/mixins.py	90.91% <100.00%> (ø)
src/plumpy/base/state_machine.py	86.13% <80.00%> (ø)
src/plumpy/utils.py	82.12% <0.00%> (+0.61%)	⬆️
src/plumpy/persistence.py	93.91% <33.34%> (ø)
src/plumpy/processes.py	92.47% <83.34%> (+0.02%)	⬆️
src/plumpy/process_listener.py	85.19% <78.58%> (-8.14%)	⬇️
src/plumpy/event_helper.py	77.42% <77.42%> (ø)

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