ray: update KubeRay and Ray versions

[danish9039]

Pull Request Template for Kubeflow Manifests

Summary of Changes

This PR updates the experimental Ray manifests to align the checked-in KubeRay operator and Ray example/test versions:

• KubeRay chart/operator: 1.6.2
• Ray example/test image: rayproject/ray:2.56.0-py311-cpu
• Ray example rayVersion: 2.56.0

The KubeRay operator resources were regenerated with the existing Makefile path.

Reviewer note: the generated KubeRay 1.6.2 chart has large expected churn. It adds the raycronjobs.ray.io CRD and RayCronJob roles, expands operator RBAC for resources such as secrets, pods/resize, endpointslices, and Gateway API resources, and raw generated namespaced objects include namespace: default; the Kubeflow overlay still renders namespaced resources into kubeflow.

This PR intentionally does not include the restricted-PSS Ray example changes from #3487.

Dependencies

No direct dependency. Related to the broader PR split from #3487.

Related Issues

Related to #3487.

Contributor Checklist

• I have tested these changes with kustomize. See Installation Prerequisites.
• All commits are signed-off to satisfy the DCO check.
• I have considered adding my company to the adopters page to support Kubeflow and help the community, since I expect help from the community for my issue (see 1. and 2.).

Validation:

• make -C experimental/ray kuberay-operator/base
• kustomize build experimental/ray/kuberay-operator/base
• kustomize build experimental/ray/kuberay-operator/overlays/kubeflow
• rendered operator image/namespace assertion
• bash -n experimental/ray/test.sh
• git diff --check

[google-oss-prow]

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Details

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• experimental/ray/OWNERS

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[github-actions]

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[Copilot]

Pull request overview

This pull request updates the experimental Ray manifests to align the checked-in KubeRay operator/chart version and the Ray example/test versions.

Changes:

• Bumped the KubeRay Helm chart/operator version to 1.6.2 in the experimental Ray Makefile.
• Updated the Ray example/test versions to Ray 2.56.0 across the README, example RayCluster manifest, and test script.
• Updated the RayCluster example images to rayproject/ray:2.56.0-py311-cpu.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

File	Description
experimental/ray/test.sh	Updates the expected Ray version for the smoke test.
experimental/ray/README.md	Updates documented Ray image and client install version to 2.56.0.
experimental/ray/raycluster_example.yaml	Updates RayCluster rayVersion and container images to 2.56.0.
experimental/ray/Makefile	Bumps KubeRay chart version to 1.6.2.