[Release] xgboost_ray fault tolerance tests don't pass with xgboost v1.5.0

[amogkam]

The ft_small_elastic and ft_small_nonelastic tests are passing with the ray-ml:pinned-nightly base image, but are failing on the ray:nightly image.

We should fix the Docker image so that xgboost_ray works out of the box with the image.

[amogkam]

Looks like this is due to an issue with xgboost-ray compatibility with newer versions of xgboost (1.5.0): ray-project/xgboost_ray#176.

So the issue is not related to Ray or the Ray Docker image. Will remove this as a release blocker.

[amogkam]

Once ray-project/xgboost_ray#176 is fixed, will upgrade back to the ray:nightly image.

[krfricke]

See also dmlc/xgboost#7436

I'm going to fix this this week.

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