Bump hex-literal from 0.3.4 to 0.4.0

Bumps [hex-literal](https://github.com/RustCrypto/utils) from 0.3.4 to 0.4.0.
- [Release notes](https://github.com/RustCrypto/utils/releases)
- [Commits](https://github.com/RustCrypto/utils/compare/hex-literal-v0.3.4...hex-literal-v0.4.0)

---
updated-dependencies:
- dependency-name: hex-literal
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>