Update Blueback site config: PrgEnv-*/8.7.0

[climbfuji]

Description

The PrgEnv-*/8.6.0 modules have been updated to 8.7.0 on Blueback.

Dependencies

None

Issues addressed

NRL-internal issue

Applications affected

NEPTUNE

Systems affected

Blueback

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
  • Blueback/NEPTUNE

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