Bump matplotlib from 3.8.3 to 3.8.4

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.8.3 to 3.8.4.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.8.3...v3.8.4)

---
updated-dependencies:
- dependency-name: matplotlib
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

setup.py

@@ -35,7 +35,7 @@
         'pyiron_base==0.7.7',
         'pyiron_atomistics==0.4.17',
         'ipywidgets==8.1.2',
-        'matplotlib==3.8.3',
+        'matplotlib==3.8.4',
         'nbconvert==7.16.3',
         'nbformat==5.10.3',
         'numpy==1.26.4',