prepare for python 3.12

[zktuong]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.39%. Comparing base (ce1b52d) to head (8947ba6). Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #363      +/-   ##
==========================================
- Coverage   84.40%   84.39%   -0.01%     
==========================================
  Files          52       52              
  Lines        9463     9461       -2     
==========================================
- Hits         7987     7985       -2     
  Misses       1476     1476              

Flag	Coverage Δ
unittests	84.39% <100.00%> (-0.01%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
tests/test_travdv.py	100.00% <100.00%> (ø)