[RELEASE ONLY CHANGES] Install torch, vision and audio RC

[rascani]

Summary

This change switches the release branch to install torch, audio, and vision from their respective release candidates, rather than building. See PR #14642 for previous example.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16723

• 📄 Preview Python docs built from this PR

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

❌ 1 New Failure, 4 Cancelled Jobs

As of commit f87c040 with merge base 7492d0d ():

NEW FAILURE - The following job has failed:

• pull / test-lora-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 9321976bbe27d085588ded136bf1f0999cf3ef86c94f20176dd3d8f773d0cace /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• Lint / link-check / lint-file-size / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-demo-backend-delegation (buck2) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-demo-backend-delegation (cmake) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / unittest-release / macos / macos-job (gh)
  ##[error]The operation was canceled.

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