[functorch hash update] update the pinned functorch hash (#81748)
This PR is auto-generated nightly by [this action](https://github.com/pytorch/pytorch/blob/master/.github/workflows/_update-commit-hash.yml).
Update the pinned functorch hash.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/81748
Approved by: https://github.com/pytorchbot
