Update Downgrade.yml

[ChrisRackauckas]

No description provided.

[JoshuaLampert]

The downgrade test doesn't use the downgraded package versions, right? For instance, during julia-runtest ArrayInterface v7.19.0 is used (see https://github.com/SciML/SciMLBase.jl/actions/runs/16542253836/job/46785073774?pr=1075#step:6:58), while the resolver chooses ArrayInterface v7.9.0 (see https://github.com/SciML/SciMLBase.jl/actions/runs/16542253836/job/46785073774?pr=1075#step:4:51). The same thing also happened for the test PR #1070 and this is also what I noticed in NumericalMathematics/DispersiveShallowWater.jl#227. The tests are supposed to run on the package versions Resolver.jl obtains, right? Now the tests run on the same versions as the usual CI runs, which means it doesn't really test anything new.

[ChrisRackauckas]

@StefanKarpinski does the minimum resolver respect Julia version for the standard libraries?

[StefanKarpinski]

It should

[ChrisRackauckas]

It doesn't seem to prevent LinearAlgebra v1.10 on Julia v1.11 🤷 , but if we only use the downgrade CI on LTS it seems like that's a fine solution. Thanks @StefanKarpinski looks like it's fully in play now! 30 PRs to make.