Update pytorch pin (#3562)

Summary:
Action item for: https://github.com/pytorch/executorch/issues/3561

There are torch nightlies where yaml files don't exist (https://github.com/pytorch/pytorch/issues/124941) in certain wheels.

Pull Request resolved: https://github.com/pytorch/executorch/pull/3562

Test Plan: `unzip -t torch-2.4.0.dev20240507+cu118-cp38-cp38-linux_x86_64.whl | grep yaml` and make sure yaml files exist.

Reviewed By: tarun292

Differential Revision: D57163422

Pulled By: mergennachin

fbshipit-source-id: ba087ccd31315932c3203d5d7e5ec0d7a19878b6