Description

NDSL tests were logging the following deprecation warning for using use_cftime=True when opening a dataset (e.g. model state)

 tests/test_legacy_restart.py::test_read_state_non_scalar_time
  /__w/NDSL/NDSL/ndsl/io.py:72: DeprecationWarning: Usage of 'use_cftime' as a kwarg is deprecated. Please pass a 'CFDatetimeCoder' instance initialized with 'use_cftime' to the 'decode_times' kwarg instead.
  Example usage:
      time_coder = xr.coders.CFDatetimeCoder(use_cftime=True)
      ds = xr.open_dataset(decode_times=time_coder)
  
    ds = xr.open_dataset(f, use_cftime=True)

(as see in e.g. this run)

How Has This Been Tested?

By running tests and confirming that the warning isn't in the logs anymore.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas: N/A
• I have made corresponding changes to the documentation: N/A
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules: N/A
• New check tests, if applicable, are included: N/A