Update spack branch spack-stack-dev from spack develop hash a9c879d

[climbfuji]

Summary

This PR updates our spack branch spack-stack-dev from spack develop hash a9c879d (last hash before the compilers as dependencies/nodes PR was merged).

Important consequences of this update:

• Syntax %gcc platform=darwin (or, in general, %compiler variants) must be changed to platform=darwin %gcc
• core_compilers is not a valid option for TCL modules, remove and update setup-meta-modules extension
• Bump Python from 3.11.7 to 3.11.11, Openmpi to 5.0.6
• Remove Ubuntu Intel CI workflow - Intel Classic compilers are no longer supported from this PR onwards
• Pin glib to 2.78.3 to avoid circular dependency with gobject-introspection
• Allow installation of deprecated packages (need for py-werkzeug)
• Update spack imports in spack-stack extension

Also:

• Update of GitHub runners for unit/util tests (no more Ubuntu 20.04), use newer version of checkout action

NOT DONE IN THIS PR

• Testing installs on other platforms than the ones listed below
• Testing builds for JEDI containers

Testing

• Test installs on @climbfuji's dev systems using Intel LLVM mixed, Intel LLVM, GCC
• CI
• Test installs on NRL systems using Intel LLVM mixed, Intel LLVM, GCC

Applications affected

Potentially all

Systems affected

Potentially all (rely on CI testing and fix site configs later during rollout/using spack-stack automation)

Dependencies

• waiting on Update spack-stack-dev from spack develop a9c879d spack#534

Issue(s) addressed

Working towards #1604

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.