Bump matplotlib from 3.7.0 to 3.9.3

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.7.0 to 3.9.3.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.7.0...v3.9.3)

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

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

requirements.txt

@@ -1,4 +1,4 @@
-matplotlib==3.7.0
+matplotlib==3.9.3
 numpy==1.24.0
 scipy==1.10.1; python_version < '3.9'
 scipy==1.13.0; python_version >= '3.9'