fix: adjust aws_c5.18xlarge memory size (#991) · pytorch/torchx@357b9d9

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The ubuntu-20.04 runner image will be end of life on 2025-04-01. Jobs using the ubuntu-20.04 image should be updated to ubuntu-22.04 or ubuntu-24.04. For more details, see https://github.com/actions/runner-images/issues/11101