Release/gfs.v16.3.12: Increase gdasediag memory requirements

[ADCollard]

The gdasediag step was hitting the memory limit with the new instruments. This doubles the memory for this single-node job.

This references #2096

Checklist

• Any dependent changes have been merged and published
• 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
• My changes generate no new warnings
• New and existing tests pass with my changes
• I have made corresponding changes to the documentation if necessary

[KateFriedman-NOAA]

Looks good and matches discussed changes. Thanks @ADCollard !