Avoid deprecated floating_point_precision()

[romanc]

Description

With PR NOAA-GFDL/NDSL#104 that function was deprecated in favor of get_precision(). The new function is a drop-in replacement for the old one. Since we use NDSL version 2025.03.00 now, we can use the new function name.

How Has This Been Tested?

Should be covered by CI.

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
• New check tests, if applicable, are included: N/A
• Targeted model if this changed was triggered by a model need/shortcoming: N/A

[romanc]

/cc @FlorianDeconinck

We should probably add a deprecation warning in NDSL, such that we can then remove the function in a future version (after a grace period).

[FlorianDeconinck]

We should even be more aggresive, drop the old one altogether and fix the failures.