fix py13 import bug

[s3alfisc]

Fix #1263.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
core-tests	71.09% <100.00%> (+0.08%)	⬆️
test-r-core	52.69% <100.00%> (+0.08%)	⬆️
test-r-extended	18.89% <100.00%> (+0.14%)	⬆️
test-r-fixest	39.94% <100.00%> (+0.10%)	⬆️
tests-extended	?

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Files with missing lines	Coverage Δ
pyfixest/estimation/FixestMulti_.py	82.10% <100.00%> (+0.09%)	⬆️
pyfixest/estimation/api/feglm.py	90.00% <100.00%> (+0.34%)	⬆️
pyfixest/estimation/api/feols.py	100.00% <100.00%> (ø)
pyfixest/estimation/api/fepois.py	96.15% <100.00%> (+0.15%)	⬆️
pyfixest/estimation/api/quantreg.py	87.23% <100.00%> (+0.27%)	⬆️
pyfixest/estimation/api/utils.py	95.29% <100.00%> (+0.05%)	⬆️
pyfixest/estimation/models/feglm_.py	75.00% <100.00%> (+0.09%)	⬆️
pyfixest/estimation/models/feols_.py	87.18% <100.00%> (-5.03%)	⬇️
pyfixest/estimation/models/feols_compressed_.py	80.35% <100.00%> (+0.11%)	⬆️
pyfixest/estimation/models/fepois_.py	78.54% <100.00%> (+0.09%)	⬆️
... and 2 more

... and 5 files with indirect coverage changes

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