GitHub Actions switched `ubuntu-latest` to `ubuntu-20.04` Ref: https://github.com/actions/virtual-environments/issues/1816 https://github.com/actions/virtual-environments/pull/2852
GitHub Actions switched `ubuntu-latest` to `ubuntu-20.04` Ref: https://github.com/actions/virtual-environments/issues/1816 https://github.com/actions/virtual-environments/pull/2852