(Re-land) 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.

Move logic of adding fake properties to sys.stdout from main to top level imports, as ray.tune will expect sys.stdout to have an encoding, which is missing in sphinx
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/2791

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

✅ No Failures

As of commit bab2780 with merge base 475671e ():
💚 Looks good so far! There are no failures yet. 💚

This comment was automatically generated by Dr. CI and updates every 15 minutes.