Action Caching broken on Windows

[jpfairbanks]

According to the logs of https://github.com/AlgebraicJulia/CombinatorialSpaces.jl/actions/runs/11620242208/job/32361595023#step:5:127

Looks like issues with the path separator and it just being removed

mkdir -p C:\Users\runneradmin/.julia

This becomes this when executed:

Run mkdir -p C:Usersrunneradmin/.julia

This looks like it is fixed in the follwing PR julia-actions/cache#146

We need to be using the release https://github.com/julia-actions/cache/releases/tag/v2.0.5

[mehalter]

This wasn't fixed by that PR and the linked job is using that version. The linked PR fixes a different issue and doesn't account for this new issue

[mehalter]

This should be reported and fixed upstream