Update to MAPL 2.39.7

[mathomp4]

This PR updates GEOSgcm to use MAPL 2.39.7. This has two patches on top of 2.39.5:

[2.39.7] - 2023-07-18

Fixed

• Fix a bug so that MultigroupServer does not allow a file written by multiple processes at the same time.

[2.39.6] - 2023-07-18

Changed

• Relaxed restriction in the tripolar grid factory so that grids can be made even when the decomposition deos not evenly divide the grid dimension so that the factory can be used in utilities where the core count makes such a condition impossible to satisfiy

Fixed

• Fix a bug in time_ave_util.x so that it can work with files with no vertical coordinate

All testing shows it zero-diff.