Automated submodule update: vrs (#58)

Summary:
This is an automated pull request to update the first-party submodule for [facebookresearch/vrs](https://github.com/facebookresearch/vrs).

New submodule commit: facebookresearch/vrs@5ab009d

Pull Request resolved: #58

Test Plan: Ensure that CI jobs succeed on GitHub before landing.

Reviewed By: georges-berenger

Differential Revision: D57443459

fbshipit-source-id: 81352b6158c79ad0fb71faa3bcc8d76caf1f9337