Update default package versions for g2c wgrib2

[rickgrubin-noaa]

Description

This PR adds versions for g2c and wgrib2 packages.

Dependencies

• waiting on g2c and wgrib2: add g2c@2.3.0, g2c@2.20 and wgrib2@3.8.0, wgrib2@3.7.0 spack-packages#38

Issues addressed

Resolves #1832

Applications affected

UFS WM, any others that utilize / depend on wgrib2

Systems affected

Likely all JCSDA / NRL / EPIC hosts.

Testing

• CI: Note whether the automatic tests (GitHub actions tests that run automatically for every commit) pass or not
  • GitHub actions CI tests pass
  • GitHub actions CI tests do not pass (provide explanation)
  • GitHub actions CI tests skipped (provide explanation if necessary)
• New tests added: List and describe any new tests added to GitHub actions
  • ...
• Additional testing: Add information on any additional tests conducted
  • ...

Checklist

• This PR addresses one issue/problem/enhancement or has a very good reason for not doing so.
• These changes have been tested on the affected systems and applications.
• All dependency PRs/issues have been resolved and this PR can be merged.
• All necessary updates to the documentation (spack-stack wiki) will be made when this PR is merged

[climbfuji]

Please commit the submodule pointer update for spack-packages (repos/builtin) so that this PR temporarily points to your fork/branch for testing.

[climbfuji]

Please commit the submodule pointer update for spack-packages (repos/builtin) so that this PR temporarily points to your fork/branch for testing.

Actually, I'll just merge the spack-spackages PR, then all you need to do is to update spack-packages to the head of spack-stack-dev.

[climbfuji]

New spack-packages hash is JCSDA/spack-packages@64cccad