chore(deps): Bump regex-automata in /src/code-validator/guest (#307)

Bumps [regex-automata](https://github.com/rust-lang/regex) from 0.4.15 to 0.4.18.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](rust-lang/regex@regex-automata-0.4.15...regex-automata-0.4.18)

---
updated-dependencies:
- dependency-name: regex-automata
  dependency-version: 0.4.18
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]