MAINT: Bump the core group across 1 directory with 2 updates (#3106)

Bumps the core group with 2 updates in the /.devcontainer directory: [matplotlib](https://github.com/matplotlib/matplotlib) and [pyvista](https://github.com/pyvista/pyvista).


Updates `matplotlib` from 3.8.4 to 3.9.0
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.8.4...v3.9.0)

Updates `pyvista` from 0.43.7 to 0.43.8
- [Release notes](https://github.com/pyvista/pyvista/releases)
- [Commits](pyvista/pyvista@v0.43.7...v0.43.8)

---
updated-dependencies:
- dependency-name: matplotlib
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: core
- dependency-name: pyvista
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: core
...

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

.devcontainer/codespaces-dev/requirements.txt

@@ -1,12 +1,12 @@
 ansys-dpf-core==0.10.1
 autopep8==2.1.0
-matplotlib==3.8.4
+matplotlib==3.9.0
 scipy==1.13.0
 pandas==2.2.2
 pyiges[full]==0.3.1
 pytest==8.2.0
 pytest-cov==5.0.0
-pyvista==0.43.7
+pyvista==0.43.8
 pyansys-tools-report==0.7.0
 vtk==9.3.0
 pytest-rerunfailures==14.0