Cloud-J submod update: Update to version 7.7.3

This commit informs the GCClassic superproject about the following
commits that were pushed to the GitHub geoschem/Cloud-J repository:

d20050f Update version to 7.7.3
441f325 Merge pull request #23 from geoschem/feature/improve_speed_by_reducing_error_checks
c4e500c Remove gcc 11 and add gcc 14 to mac workflows

Cloud-J 7.7.3 contains these fixes & features:

- Minimized usage and checks of error codes to speed up the model

- Removed safety initialization of outputs where assigning all values
  is obvious to improve performance

- Replaced GCC 11 with GCC 14 in GitHub actions to build Cloud-J
  standalone on MacOS.  (GCC 11 was deprecated.)

Signed-off-by: Bob Yantosca <[email protected]>