Bump Kokkos 4.4.1, Parth vov-fix

[pgrete]

Infrastructure-related changes:

• Bumps Kokkos to 4.4.1 (to include SequentialHostInit for automatic deallocation of view of views)
• Bumps Parthenon to include the view of views with SequentialHostInit
• Bumps in Parthenon also now contain an updated path to enroll (custom) boundary conditions (via named strings, see cloud pgen)

AthenaPK-related changes:

• Move the calculation of dt_diff to a single place (rather than in two different places depending on whether unsplit or rkl2 integration is used)
• dt_hyp and dt_diff are now being read from restart files (as both values are now computed at the end of the loop, the contents are relevant for determining the substages in the RKL2 integrator and thus need to be known on restart).
• Therefore, the dt plotted on the command line when using RKL2 integrator is now the correct one (previously it was overridden by the RKL2 integrator when limiting was in place only after the value was shown).

[BenWibking]

LGTM.

Only comment is that is might be slightly clearer to name dt_diff instead dt_parabolic or similar for consistency with dt_hyp (assuming hyp is for hyperbolic).