Test python 3.12 and aiida-core=2.8.0 (#1466)

[danielhollas]

Same thing as in #1466 which I merged into a wrong branch, whoops.

[edan-bainglass]

👍👍

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.32%. Comparing base (c37b545) to head (ea86f82).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1470   +/-   ##
=======================================
  Coverage   72.32%   72.32%           
=======================================
  Files         112      112           
  Lines        7245     7245           
=======================================
  Hits         5240     5240           
  Misses       2005     2005           

Flag	Coverage Δ
python-3.11	?
python-3.12	72.32% <ø> (?)
python-3.9	72.35% <ø> (+0.01%)	⬆️

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