chore(deps): update dill requirement in /requirements

Updates the requirements on [dill](https://github.com/uqfoundation/dill) to permit the latest version.
- [Release notes](https://github.com/uqfoundation/dill/releases)
- [Commits](uqfoundation/dill@0.3.9...0.4.1)

---
updated-dependencies:
- dependency-name: dill
  dependency-version: 0.4.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/embedded.txt

@@ -1,4 +1,4 @@
 pyvista>=0.4 #3D visualisation/vtk meshing
 LoopStructural>=1.6.6 #3D geological modelling
 geoh5py>=0.9 #saving models to hdf5
-dill>=0.3.9     #saving models to python
+dill>=0.4.1     #saving models to python

requirements/testing.txt

@@ -6,7 +6,7 @@ packaging>=23
 pyvista>=0.4 #3D visualisation/vtk meshing
 LoopStructural>=1.6.23 #3D geological modelling
 geoh5py>=0.9 #saving models to hdf5
-dill>=0.3.9     #saving models to python
+dill>=0.4.1     #saving models to python
 shapely
 geopandas
 map2loop~=3.3.1