update MOM6 to its main repo. 20250801 commit

[jiandewang]

MOM6 main repo. is updated on 20250801 which is originally GFDL-20250721 PR (see detail at mom-ocean/MOM6#1668). Need to make corresponding updating in dev/emc.
NO baseline change inn this PR

[dpsarmie]

This was merged as part of #2719. Closing.