[test only] update PT pin to 0723

[kirklandsign]

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/4401

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❌ 5 New Failures

As of commit 4840fd7 with merge base d8866e3 ():

NEW FAILURES - The following jobs have failed:

• Android / test-llama-app (bpe) / mobile-job (android) (gh)
  Could not assume role with user credentials: User: arn:aws:sts::308535385114:assumed-role/gh-ci-github-action-runners-runner-role/i-02c7d98066af115b8 is not authorized to perform: sts:TagSession on resource: arn:aws:iam::308535385114:role/gha_workflow_mobile_job
• Apple / upload-frameworks-ios (gh)
  Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers
• pull / test-llama-runner-linux (fp32, buck2, portable) / linux-job (gh)
  RuntimeError: Command docker exec -t a14ce42228e09ad1d66113086282b65e0bff447fbb86381ee58e51278432bc7e /exec failed with exit code 1
• pull / test-llama-runner-linux (fp32, cmake, portable) / linux-job (gh)
  RuntimeError: Command docker exec -t b43c6dd5b5e32d559f7ca911e5e53ac2e50d686f535e9f0aee8c1d4b683eb614 /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  examples/models/test/test_export.py::ExportTest::test_vit_export_to_executorch

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