Bump xgboost from 1.5.2 to 1.6.0

Bumps [xgboost](https://github.com/dmlc/xgboost) from 1.5.2 to 1.6.0.
- [Release notes](https://github.com/dmlc/xgboost/releases)
- [Changelog](https://github.com/dmlc/xgboost/blob/master/NEWS.md)
- [Commits](dmlc/xgboost@v1.5.2...v1.6.0)

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

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

Author: dependabot[bot]

requirements_test.txt

@@ -37,7 +37,7 @@ torchvision==0.12.0+cpu
 catboost==1.0.5
 GPy==1.10.0
 lightgbm==3.3.2
-xgboost==1.5.2
+xgboost==1.6.0
 
 kornia~=0.6.4
 tensorboardX==2.5