Bump radiant-mlhub from 0.4.1 to 0.5.5 in /requirements

Bumps [radiant-mlhub](https://github.com/radiantearth/radiant-mlhub) from 0.4.1 to 0.5.5.
- [Release notes](https://github.com/radiantearth/radiant-mlhub/releases)
- [Changelog](https://github.com/radiantearth/radiant-mlhub/blob/main/CHANGELOG.md)
- [Commits](https://github.com/radiantearth/radiant-mlhub/compare/v0.4.1...v0.5.5)

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

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

Author: dependabot[bot]

requirements/datasets.txt

@@ -5,7 +5,7 @@ opencv-python==4.7.0.72
 pandas==2.0.0
 pycocotools==2.0.6
 pyvista==0.38.5
-radiant-mlhub==0.4.1
+radiant-mlhub==0.5.5
 rarfile==4.0
 scikit-image==0.20.0
 scipy==1.9.1