Update PT pin to 6/18

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Differential Revision: D58732403

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/4007

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:x: 4 New Failures

As of commit 6fcb6438e8ce5cc0f5ec31ead20a6b6c9cbe9eda with merge base c6fb9da97ec70712227ed16aa6adb375871dbe62 ():

NEW FAILURES - The following jobs have failed:

* [Android / test-llama-app / mobile-job (android)](https://hud.pytorch.org/pr/pytorch/executorch/4007#26377673589) ([gh](https://github.com/pytorch/executorch/actions/runs/9567582375/job/26377673589)) `Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers` * [Apple / upload-frameworks-ios](https://hud.pytorch.org/pr/pytorch/executorch/4007#26379253630) ([gh](https://github.com/pytorch/executorch/actions/runs/9567582352/job/26379253630)) `Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers` * [pull / test-models-linux (cmake, mv3, portable, linux.2xlarge, 90) / linux-job](https://hud.pytorch.org/pr/pytorch/executorch/4007#26375702075) ([gh](https://github.com/pytorch/executorch/actions/runs/9567582419/job/26375702075)) `curl: (22) The requested URL returned error:` * [trunk / test-models-macos (cmake, ic4, portable, macos-m1-stable, 90) / macos-job](https://hud.pytorch.org/pr/pytorch/executorch/4007#26377367112) ([gh](https://github.com/pytorch/executorch/actions/runs/9568070537/job/26377367112)) `##[error]The operation was canceled.`

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This pull request was exported from Phabricator. Differential Revision: D58732403

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This pull request has been merged in pytorch/executorch@172574a6be5910a4609e4ed1bef2b6b8475ddb3d.