Fix typo in build_executor_runner.sh

[digantdesai]

As title

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12888

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 681b4a9 with merge base de0554d ():

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

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

• pull / test-phi-3-mini-runner-linux / linux-job (gh) (trunk failure)
  AttributeError: 'StaticCacheConfig' object has no attribute 'get'

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