Automated submodule update: vrs (#135)

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@694aefa

Pull Request resolved: #135

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

Reviewed By: georges-berenger

Differential Revision: D66805095

fbshipit-source-id: 372bd95adb31d7fcf858d5f2d433a59de00ebd79