Dependencies - downgrade pandas to >=1.5.3

[claudio-tw]

Context

If you use pandas>=2.0 with CatBoost, you'll find that fitting a model would raise

AttributeError: 'DataFrame' object has no attribute 'iteritems'

Therefore this PR relaxes the requirements on pandas and it downgrade it to 1.5.3. In this way, hisel and Catboost can run in the same environment.

Checklist

• [x] Change meets or does not compromise the Baseline Security Requirements