Bump catboost from 1.2 to 1.2.1 in /docker/ml (#19555)

Bumps [catboost](https://github.com/catboost/catboost) from 1.2 to 1.2.1.
- [Release notes](https://github.com/catboost/catboost/releases)
- [Changelog](https://github.com/catboost/catboost/blob/master/RELEASE.md)
- [Commits](https://github.com/catboost/catboost/commits)

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

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