chore(deps): update loopstructural requirement in /requirements (#116)

Updates the requirements on [loopstructural](https://github.com/loop3d/loopstructural) to permit the latest version.
- [Release notes](https://github.com/loop3d/loopstructural/releases)
- [Changelog](https://github.com/Loop3D/LoopStructural/blob/master/CHANGELOG.md)
- [Commits](Loop3D/LoopStructural@v1.7.0...v1.8.0)

---
updated-dependencies:
- dependency-name: loopstructural
  dependency-version: 1.8.0
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements/embedded.txt

@@ -1,4 +1,4 @@
 pyvista>=0.4 #3D visualisation/vtk meshing
-LoopStructural~=1.7.0 #3D geological modelling
+LoopStructural~=1.8.0 #3D geological modelling
 geoh5py>=0.9 #saving models to hdf5
 dill>=0.4.1     #saving models to python

requirements/testing.txt

@@ -4,7 +4,7 @@
 pytest-cov>=7.1.0
 packaging>=23
 pyvista>=0.4 #3D visualisation/vtk meshing
-LoopStructural~=1.7.0 #3D geological modelling
+LoopStructural~=1.8.0 #3D geological modelling
 geoh5py>=0.9 #saving models to hdf5
 dill>=0.4.1     #saving models to python
 shapely