Update ray to 2.7.2

[malfet]

To address numerous CVE that older Ray releases were affected by see https://www.anyscale.com/blog/update-on-ray-cves-cve-2023-6019-cve-2023-6020-cve-2023-6021-cve-2023-48022-cve-2023-48023

Use legacy APIs by setting RAY_AIR_NEW_PERSISTENCE_MODE environment variable to zero.
Please note, that this increases tutorial runtime from 4 to 10 min

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2789

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❌ 16 New Failures

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NEW FAILURES - The following jobs have failed:

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• Build tutorials / pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu) (gh)
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