[RELEASE-ONLY CHANGES] Update release/0.2 to pin and test against PyTorch release/2.3

[guangy10]

• [RELEASE-ONLY CHANGES] Branch Cut for Release 0.2 ([RELEASE-ONLY CHANGES] Branch Cut for Release 0.2 #2735)
• [RELEASE-ONLY CHANGES] Update release/0.2 to pin and test against PyTorch release/2.3

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/2815

• 📄 Preview Python docs built from this PR

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

❌ 3 New Failures

As of commit bac5729 with merge base 4b0ed91 ():

NEW FAILURES - The following jobs have failed:

• Apple / test-demo-ios / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 65
• Build Linux Wheels / pytorch/executorch / upload / manywheel-py3_8-cpu (gh)
  Unable to find any artifacts for the associated workflow
• Build M1 Wheels / pytorch/executorch / upload / wheel-py3_8-cpu (gh)
  Unable to find any artifacts for the associated workflow

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[guangy10]

The PR is created off main, which doesn't look correct.