Add pyre-ignore to fix executorch for D59723984 (#4260)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/4260

D59723984 improves some typing for pytorch proxy_tensor - but it causes executorch to get some minor type errors.  This should allow the subsequent diffs to pass.

Reviewed By: oulgen

Differential Revision: D59726906

fbshipit-source-id: 9d2a6909c1e478b145a8bcc7c9c6b6ab31964767