Bumps [hex-literal](https://github.com/RustCrypto/utils) from 0.2.0 to 0.2.1. - [Release notes](https://github.com/RustCrypto/utils/releases) - [Commits](https://github.com/RustCrypto/utils/compare/hex-literal-v0.2.0...hex-literal-v0.2.1) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>