fix: build for python 3.13

[fatih-acar]

#256 was supposed to reintroduce 3.13 support, but according to CI logs:

Edit: need to investigate why poetry install is 20x slower with 3.13...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@                Coverage Diff                @@
##           infrahub-develop     #287   +/-   ##
=================================================
  Coverage             70.53%   70.53%           
=================================================
  Files                    81       81           
  Lines                  7561     7561           
  Branches               1469     1469           
=================================================
  Hits                   5333     5333           
  Misses                 1849     1849           
  Partials                379      379           

Flag	Coverage Δ
integration-tests	22.27% <ø> (ø)
python-3.10	45.62% <ø> (ø)
python-3.11	45.62% <ø> (+0.02%)	⬆️
python-3.12	45.62% <ø> (ø)
python-3.13	45.60% <ø> (ø)
python-3.9	44.43% <ø> (-0.03%)	⬇️
python-filler-3.12	24.07% <ø> (ø)

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[ogenstad]

LGTM, but based on that screenshot it seems like we also need to end with a test that validates that the running Python version is the one that we expect. :/ Without that I don't see how we could trust these tests.