Deprecation warning in dump_prescales.py

[mmarchegiani]

Opening this issue to keep track of a deprecation warning.
When running the dump_prescales.py script to extract the prescale factors:

python scripts/dump_prescale.py --HLT BTagMu_AK8DiJet170_Mu5 -l $PARAMS_DIR/Cert_Collisions2022_355100_362760_Golden.json

one gets the following deprecation warning:

/afs/cern.ch/work/m/mmarcheg/BTV/BTVNanoCommissioning/scripts/dump_prescale.py:114: PydanticDeprecatedSince20:
The `parse_obj` method is deprecated; use `model_validate` instead.
Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.11/migration/

Probably the pars_obj function needs to be replace by the recommended one.