[tune](deps): Bump xgboost in /python/requirements/ml

Bumps [xgboost](https://github.com/dmlc/xgboost) from 1.3.3 to 1.6.1.
- [Release notes](https://github.com/dmlc/xgboost/releases)
- [Changelog](https://github.com/dmlc/xgboost/blob/master/NEWS.md)
- [Commits](dmlc/xgboost@v1.3.3...v1.6.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

python/requirements/ml/requirements_tune.txt

@@ -35,5 +35,5 @@ timm==0.4.5
 transformers==4.18.0; python_version <= '3.6'
 transformers==4.19.1; python_version > '3.6'
 wandb==0.13.4
-xgboost==1.3.3
+xgboost==1.7.1
 zoopt==0.4.1