Bump mlua from 0.7.4 to 0.9.9

Bumps [mlua](https://github.com/khvzak/mlua) from 0.7.4 to 0.9.9.
- [Release notes](https://github.com/khvzak/mlua/releases)
- [Changelog](https://github.com/mlua-rs/mlua/blob/main/CHANGELOG.md)
- [Commits](mlua-rs/mlua@v0.7.4...v0.9.9)

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

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