Bump OrdinaryDiffEqCore.jl compat to v2, remove older v1 compat

[abhro]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the contributor guidelines, in particular the SciML Style Guide and COLPRAC.
• Any new documentation only uses public API

Additional context

In keeping with SciML/OrdinaryDiffEq.jl#2927

[abhro]

This PR should also probably bump the version? Unsure if this is a breaking change, however.

[devmotion]

Unsure if this is a breaking change, however.

It's not breaking for users or other packages in general. However, it is breaking for the OrdinaryDiffEq subpackages that used to load @unpack indirectly via OrdinaryDiffEqCore.

[abhro]

It's not breaking for users or other packages in general. However, it is breaking for the OrdinaryDiffEq subpackages that used to load @unpack indirectly via OrdinaryDiffEqCore.

Got it, thanks! So would this be a minor or a patch release?

[devmotion]

Minor: https://docs.sciml.ai/ColPrac/stable/#Changing-dependency-compatibility