Upgrade to checkout@v3 (#1240)
Summary:
To shed the following warning from GHA:
```
Node.js 12 actions are deprecated. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/. Please update the following actions to use Node.js 16: actions/checkout, actions/upload-artifact, actions/checkout
```
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1240
Reviewed By: davidberard98
Differential Revision: D40306180
Pulled By: xuzhao9
fbshipit-source-id: 25ad5ad9f80916c3adb8521c898f36e5da4e51fd
