Bump dm-tree from 0.1.5 to 0.1.6 in /.depends (#162)

Bumps [dm-tree](https://github.com/deepmind/tree) from 0.1.5 to 0.1.6.
- [Release notes](https://github.com/deepmind/tree/releases)
- [Changelog](https://github.com/deepmind/tree/blob/master/docs/changes.rst)
- [Commits](google-deepmind/tree@0.1.5...0.1.6)

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

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

Author: dependabot[bot]

.depends/requirements.txt

@@ -49,7 +49,7 @@ databricks-cli==0.15.0
 datasets==1.11.0
 dateparser==1.0.0
 descartes==1.1.0
-dm-tree==0.1.5
+dm-tree==0.1.6
 eli5==0.11.0
 fairlearn==0.5.0
 fastai>=2.2.7,<=2.3.1