build(deps): bump matplotlib from 3.9.2 to 3.9.3

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]>

requirements.txt

@@ -28,7 +28,7 @@ lxml==5.3.0
     # via
     #   -r dspyce-requirements.txt
     #   dspyce
-matplotlib==3.9.2
+matplotlib==3.9.3
     # via
     #   -r dspyce-requirements.txt
     #   dspyce