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

[swolchok]

This reverts commit 6b3f172. It requires an additional internal-only change and will be reapplied shortly.

[swolchok]

Stack from ghstack (oldest at bottom):

• -> Revert "Bump PyTorch pin to 20250706 (#12253)" #12327

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12327

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure, 5 Unrelated Failures

As of commit b319fde with merge base 6ac5df2 ():

NEW FAILURE - The following job has failed:

• trunk / test-arm-cortex-m-size-test (bare_metal) / linux-job (gh)
  RuntimeError: Command docker exec -t b588b0e70bc6f95989453f340ccaa23c280ce321a78c387dfa2019cc2492ebc8 /exec failed with exit code 1

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

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

• Apple / build-benchmark-app / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 74
• Apple / build-demo-ios / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 74
• 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 / 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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