avro

Bump darling from 0.14.3 to 0.14.4 in /lang/rust (#2138)

Bumps [darling](https://github.com/TedDriggs/darling) from 0.14.3 to 0.14.4.
- [Release notes](https://github.com/TedDriggs/darling/releases)
- [Changelog](https://github.com/TedDriggs/darling/blob/master/CHANGELOG.md)
- [Commits](https://github.com/TedDriggs/darling/compare/v0.14.3...v0.14.4)

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

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