Update readme

README.md

@@ -252,7 +252,8 @@ with:
 This action has been tested for GitHub-hosted runners (Ubuntu, macOS, Windows).
 To use this action in self-hosted runners or in containers, at least the following tools are required:
 
-- bash, GNU Coreutils, GNU grep, GNU tar
+- bash
+- GNU tar
 - curl
 - git
 - [gh (GitHub CLI)](https://github.com/cli/cli#installation)
@@ -264,8 +265,10 @@ To use this action in self-hosted runners or in containers, at least the followi
 - [setup-cross-toolchain-action]: GitHub Action for setup toolchains for cross compilation and cross testing for Rust.
 - [install-action]: GitHub Action for installing development tools (mainly from GitHub Releases).
 - [cache-cargo-install-action]: GitHub Action for `cargo install` with cache.
+- [checkout-action]: GitHub Action for checking out a repository. (Simplified actions/checkout alternative that does not depend on Node.js.)
 
 [cache-cargo-install-action]: https://github.com/taiki-e/cache-cargo-install-action
+[checkout-action]: https://github.com/taiki-e/checkout-action
 [install-action]: https://github.com/taiki-e/install-action
 [keepachangelog]: https://keepachangelog.com/en/1.0.0
 [parse-changelog]: https://github.com/taiki-e/parse-changelog