Update torchtune pin

[pytorchbot]

Summary

Current torchtune pin is not in the S3 bucket anymore. https://download.pytorch.org/whl/nightly/torchtune/

Updating to latest

Test

CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7710

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures

As of commit 9af7a5a with merge base 9069017 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 65fe21706dbf8ed39dd72329e363d5cbed342ccf1162600c1def2e28b4c364b8 /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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