GEOS-Chem submod update: Merge PR #2436, #2439, #2371 (PPN Phot etc.)

This commit informs the GCHP superproject about the following
commits that were pushed to the GitHub geoschem/geos-chem repository:

602b660c1 PR #2436 post-merge update: Fix typo in ExtData.rc.fullchem
d34c567a4 Merge PR #2436 (Update GFED4 climatology for 2010-2023)
d4c47babf Merge PR #2439 (Update run scripts and env files for Discover)
43d0e9083 Merge PR #2371 (Adding PPN photolysis)

This implements photolysis for the PPN species.  Also, two other
no-diff-to-benchmark updates have been added, namely updating run scripts
for NASA discover and updating the GFED4 climatology file.

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