Migrate to modern logger interface

[emmanuel-ferdman]

PR Summary

The logger.warn() method is deprecated since Python2.7 and replaced with logger.warning(). It leads to those warnings:

DeprecationWarning: The 'warn' method is deprecated, use 'warning' instead

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.83%. Comparing base (b28e9a3) to head (912b367).
Report is 78 commits behind head on master.

Files with missing lines	Patch %	Lines
torch_frame/utils/infer_stype.py	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #537      +/-   ##
==========================================
- Coverage   93.58%   92.83%   -0.76%     
==========================================
  Files         126      129       +3     
  Lines        6592     6766     +174     
==========================================
+ Hits         6169     6281     +112     
- Misses        423      485      +62     

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