avro

Bump regex from 1.9.1 to 1.9.3 in /lang/rust (#2426)

Bumps [regex](https://github.com/rust-lang/regex) from 1.9.1 to 1.9.3.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/regex/compare/1.9.1...1.9.3)

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

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