Bump PyTorch pin to 20250706

[swolchok]

Hash is from https://hud2.pytorch.org/hud/pytorch/pytorch/nightly/0 . Picking up rename of torch/standalone in this one.

[swolchok]

Stack from ghstack (oldest at bottom):

• -> Bump PyTorch pin to 20250706 #12253

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12253

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❌ 1 Cancelled Job, 1 Pending, 3 Unrelated Failures

As of commit 49572fb with merge base d952326 ():

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-custom-ops-macos (cmake) / macos-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (similar failure)
  ##[error]The operation was canceled.
• trunk / test-arm-backend (test_pytest_ops_ethosu_fvp) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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

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

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

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