Bump runner memory for llama3_2 torchtune test_model

[jackzhxng]

Summary

Bump memory and disk space for TorchTune llama3_2 text decoder, since the test may have previously been OOMing.

Test plan

Ran the test locally with:

rm -rf cmake-out
cmake -DCMAKE_BUILD_TYPE=Debug -DEXECUTORCH_BUILD_KERNELS_OPTIMIZED=ON -DPYTHON_EXECUTABLE=python -Bcmake-out .
cmake --build cmake-out -j4 --config Debug
./cmake-out/executor_runner --model_path ./llama3_2_text_decoder.pte

Which passes because my local machine is very powerful, now temporarily enabling this test on pull to see if passes on CI.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/6890

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• [DomainsOnly] Jobs fail with GLIBC version not found

✅ You can merge normally! (1 Unrelated Failure)

As of commit 6f75c3e with merge base 54899fe ():

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-macos (cmake, llama3_2_text_decoder, portable, macos-m1-stable, 90) / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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