Update install_requirements.py: Bumping PT pin to dev20240925 (#5824)

Summary:
Bumping it to Pytorch 2.6 to pick up changes for AOTI packaging and distributed folk

Recreated Version of https://github.com/pytorch/executorch/pull/5549

Pull Request resolved: https://github.com/pytorch/executorch/pull/5824

Reviewed By: dvorjackz

Differential Revision: D63776738

Pulled By: Jack-Khuu

fbshipit-source-id: eb388e224c09be67ea01280713566a9472287ce8