⬆️ Bump cmocean from 3.0.3 to 3.1.3 (#572)

Bumps [cmocean](https://github.com/matplotlib/cmocean) from 3.0.3 to 3.1.3.
- [Release notes](https://github.com/matplotlib/cmocean/releases)
- [Commits](matplotlib/cmocean@v3.0.3...v3.1.3)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

doc/requirements.txt

@@ -7,5 +7,5 @@ ipython==8.20.0
 netCDF4==1.6.5
 xarray==2024.1.1
 matplotlib==3.8.2
-cmocean==3.0.3
+cmocean==3.1.3
 pickleshare==0.7.5