Ferrite-FEM / Ferrite-FEM/FerriteMeshParser.jl

Bad Dof-Ordering when using FerriteMeshParser in Ferrite#master

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Description

Currently when using FerriteMeshParser to parse the .inp file I get the following stiffnes matrix:
![grafik](https://github.com/user-attachments/assets/25c10946-3cd7-4c33-83bb-3ebf85ad52fd)

If I want to get a somewhat good looking matrix I have to first sort the cellsets in the Grid:
```julia
values(grid.cellsets) .|> sort!
```
I then get
![grafik](https://github.com/user-attachments/assets/81e495e0-4bb0-42ac-9ed7-b78686e824e0)

My guess is that this is because we don't use OrderedCollections like Ferrite#master does, so this should probably be a pretty simple fix?

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