chore(deps): Bump matplotlib in /flooding/sentinel2_water_extraction

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.7.5 to 3.8.4.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.7.5...v3.8.4)

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

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