Need to update git-fleximod version

[nusbaume]

Issue Type

Externals Update

Issue Description

With the addition of PUMAS and RRTMGP physics there will be submodules within submodules, as the atmospheric_physics submodule will be calling the ccpp-physics submodule that itself is calling the PUMAS and RRTMGP submodules. This sometimes doesn't work with the older version of git-fleximod currently used in CAM-SIMA, so the git-fleximod version should be updated so that the nested git submodule checkout works as expected.

Will this change answers?

No

Will you be implementing this yourself?

Any Software Engineer can do this