Automated submodule update: vrs (#129)

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@9441fb8

Pull Request resolved: #129

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

Reviewed By: georges-berenger

Differential Revision: D66017582

fbshipit-source-id: ab7014059bec3953187d6cc7624af77a878d0e0b