Bump matplotlib from 3.8.4 to 3.9.0

Bumps [matplotlib](https://github.com/matplotlib/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)

---
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

@@ -7,7 +7,7 @@ ccdproc == 2.4.2
 click == 8.1.7
 cmcrameri == 1.9
 markdown == 3.6
-matplotlib == 3.8.4
+matplotlib == 3.9.0
 numpy == 1.26.4
 oschmod == 0.3.12
 paramiko == 3.4.0