Arm backend: Fix incorrect tag name

[mansnils]

Tag name for MLSDK fetching was incorrect.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14298

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❌ 4 New Failures, 3 Cancelled Jobs, 2 Pending, 1 Unrelated Failure

As of commit 12e1c13 with merge base eec95d0 ():

NEW FAILURES - The following jobs have failed:

• pull / test-llava-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 7987d4c7641494e1431bf20bd68e24463f40bf9d440b01a6575d4468f2a65089 /exec failed with exit code 139
• trunk / test-huggingface-transformers-macos (olmo-1b|coreml_fp32_gpu|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-models-macos-cpu (resnet50, xnnpack-quantization-delegation) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / unittest-release / macos / macos-job (gh)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_all_models_with_recipes

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

• pull / test-openvino-linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• trunk / test-huggingface-transformers-macos (qwen3-0.6b|coreml_fp32_gpu|--quantize) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)

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