fix(deps): bump matplotlib from 3.8.0 to 3.9.0

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.8.0 to 3.9.0.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.8.0...v3.9.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements-docs.txt

@@ -1,4 +1,4 @@
-matplotlib==3.8.0
+matplotlib==3.9.0
 numpydoc==1.7.0
 sphinx==7.3.7
 sphinx-gallery==0.16.0