Migrate to Rocky8 installation of spack-stack on Jet

[InnocentSouopgui-NOAA]

Description

• Update Jet module file to use Rocky8 installation of spack-stack;
• Jet has been upgraded to the Rocky8 Linux OS and present module file no longer works
  Resolves Migrate to Rocky8 spack-stack on Jet #60
  Refs Migrate to Rocky8 spack-stack installations on Jet global-workflow#2377

Type of change

• Bug fix (fixes something broken)
• New feature (adds functionality)

Change characteristics

• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO

How has this been tested?

Cycled experiments (48+ hours) at resolutions

• 96/48 on xjet and kjet
• 192/96 on kjet
• 384/192 on kjet

Checklist

• Any dependent changes have been merged and published
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing tests pass with my changes
• I have made corresponding changes to the documentation if necessary

[aerorahul]

looks good.

[DavidHuber-NOAA]

Updated path is correct, verified that the C96/C48 experiment ran correctly.