Update w3emc to 2.13.0

[climbfuji]

Description

Update w3emc to 2.13.0 to support the native LLVM compilers (clang, clang++, flang-new).

Dependencies

• Waiting on Add [email protected]; add conflict for w3emc@:2.12.0 with LLVM clang spack-packages#33

Issues addressed

Closes #1870

Applications affected

All applications using CCPP plus additional UFS applications

Systems affected

Systems using the LLVM compilers (Atlantis, Bounty)

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