benchmark

91d91104 - Upgrade to upload-artifact v3 to resolve GitHub warnings (#1407)

Upgrade to upload-artifact v3 to resolve GitHub warnings (#1407) Summary: Upgrade the GHA upload-artifact to v3, and update README.md. Also, remove the dev-nightly workflow since we plan to use userbenchmark for nightly testing. Pull Request resolved: https://github.com/pytorch/benchmark/pull/1407 Reviewed By: weiwangmeta Differential Revision: D43189675 Pulled By: xuzhao9 fbshipit-source-id: a2d771ce3592ba031033d48a2c8e2c8be578bdeb