PMP pkg_resources deprecated

[minxu74]

 /pscratch/sd/m/minxu/mytest_ref_2026-03-05/config/software/conda/pmp-a0cd98ec96f7c858f788439a4f0b4951fe2d7a55/lib/python3.10/site-packages/pcmdi_metrics/resources.py:3: UserWarning: pkg_resources is deprecated as an API. See                         │
│ https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.                                                                │
│   import pkg_resources