Bump to Kokkos 4.6

[pgrete]

PR Summary

Simple bump to release 4.6.00 (mostly for latest AMD APU support and better team policy performance with the HIP backend).
Full Kokkos changelog here: https://github.com/kokkos/kokkos/blob/release-candidate-4.6.00/CHANGELOG.md#4600

As discussed this PR is not meant to go into the next release, but mainly for testing in downstream codes ping @bprather @lroberts36 @Yurlungur @pdmullen @AstroBarker @acreyes

PR Checklist

• Code passes cpplint
• New features are documented.
• Adds a test for any bugs fixed. Adds tests for new features.
• Code is formatted
• Changes are summarized in CHANGELOG.md
• Change is breaking (API, behavior, ...)
  • Change is additionally added to CHANGELOG.md in the breaking section
  • PR is marked as breaking
  • Short summary API changes at the top of the PR (plus optionally with an automated update/fix script)
• CI has been triggered on Darwin for performance regression tests.
• Docs build
• (@lanl.gov employees) Update copyright on changed files

[Yurlungur]

@lroberts36 @jdolence @pdmullen @Yurlungur should test riot with this on Darwin/Chicoma

[c-prather]

This works everywhere for me!

[Yurlungur]

🚀