S4: Upgrade to use spack stack 1.6.0 on s4

[souopgui]

Commit Queue Requirements:

• Fill out all sections of this template.
• All sub component pull requests have been reviewed by their code managers.
• Run the full RT suite (compared to current baselines) on either Hera/Derecho/Hercules AND have committed the log to my PR branch.
• Add list of all failed regression tests in "Regression Tests" section.

PR Information

Description

Upgrade to spack stack 1.6.0 on s4

Commit Message

Upgrade to use spack stack 1.6.0 on s4

Priority

• High (This PR contains a feature or fix needed for a time-sensitive project (eg, retrospectives, implementations))

Blocking Dependencies

Git Issues Fixed By This PR

ufs-community#2091

Changes

Subcomponent (with links)

• none

Input data

• No changes are expected to input data.

Regression Tests:

• No changes are expected to any regression test.

Libraries

• Not Needed

Testing Log:

• RDHPCS
  • Hera
  • Orion
  • Hercules
  • Jet
  • Gaea
  • Derecho
• WCOSS2
  • Dogwood/Cactus
  • Acorn
• CI
  • Completed
• opnReqTest
  • N/A
  • Log attached to comment

[souopgui]

Hey Ratko, I am putting this PR in your fork. It is a minor change to upgrade spack stack to v 1.6.0 on S4.
I saw that you PR is still in draft mode on the main repos and I believe it will be best if this modif is included in your PR to make sure that S4 is not left behind.