GEOS-Chem update: Merge PR #2674 (Harvard int tests use GCC12)

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

ab77f5279 Merge PR #2674 (Harvard Cannon int test now use GNU12 compilers)

This PR changes the default compiler used by integration tests on
Harvard Cannon from GCC 10.2.0 to GCC 12.2.0.

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