Bump rustls-native-certs from 0.8.3 to 0.8.4 in /codex-rs

Bumps [rustls-native-certs](https://github.com/rustls/rustls-native-certs) from 0.8.3 to 0.8.4.
- [Release notes](https://github.com/rustls/rustls-native-certs/releases)
- [Commits](rustls/rustls-native-certs@v/0.8.3...v/0.8.4)

---
updated-dependencies:
- dependency-name: rustls-native-certs
  dependency-version: 0.8.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]