Reapply "Bump PyTorch pin to 20250706 (#12253)"

[pytorchbot]

This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #12342 by @swolchok
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/swolchok/504/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/swolchok/504/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/swolchok/504/orig
@diff-train-skip-merge

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12364

• 📄 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, 4 Cancelled Jobs, 4 Unrelated Failures

As of commit 78db02f with merge base dd06b3b ():

NEW FAILURES - The following jobs have failed:

• Apple / build-demo-ios / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 65
• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• trunk / test-arm-cortex-m-size-test (bare_metal) / linux-job (gh)
  RuntimeError: Command docker exec -t 90bc296c34f3ab464cd89237f2d70db8b9c728e5e1573a46cb31a208131cdbfb /exec failed with exit code 1

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

• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (mobilebert, portable, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-linux-aarch64 (mobilebert, xnnpack-quantization-delegation, linux.arm64.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-eval_llama-mmlu-linux / linux-job (gh) (trunk failure)
  RuntimeError: Dataset scripts are no longer supported, but found mmlu_no_train.py
• trunk / test-qnn-model (fp32, mb) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  [ FAILED ] TensorPtrMakerTest.FailedCreateTensorUsingFromBlobWithIllegalStrides
• trunk / unittest-release / macos / macos-job (gh) (trunk failure)
  [ FAILED ] TensorPtrMakerTest.FailedCreateTensorUsingFromBlobWithIllegalStrides

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[github-actions]

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[swolchok]

merging bot PR based on CI from original PR

[swolchok]

build-demo-ios is red on HUD