Remove deprecated floating_point_precision()

[romanc]

Description

Remove deprecated function as discussed in NOAA-GFDL/pyFV3#54 (comment). The function was replaced with get_precision() in 2025.03.00.

How Has This Been Tested?

Fixed (upstream) PyFV3 in NOAA-GFDL/pyFV3#54. Found no occurrences in pace and PySHiELD. Updated NDSL & PyFV3 versions of pace.

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

[romanc]

Alright - this is finally up for show after updating NDSL and PyFV3 in pace.

[FlorianDeconinck]

Cheers for the dependency un-noodling