Automated submodule update: vrs (#151)

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@c347875

Pull Request resolved: #151

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

Reviewed By: georges-berenger

Differential Revision: D68991281

fbshipit-source-id: 9a2eda0f945a754a8286fb9e9ed0eb91bceebecd