MNT: (deps): Bump matplotlib from 3.9.2 to 3.9.3 in /ci

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.9.2 to 3.9.3.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.9.2...v3.9.3)

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

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

ci/requirements.txt

@@ -1,5 +1,5 @@
 #python>=3.7
-matplotlib==3.9.2
+matplotlib==3.9.3
 numpy==2.1.3
 pandas==2.2.3
 pyyaml==6.0.2