avro

Bump md-5 from 0.10.5 to 0.10.6 in /lang/rust (#2514)

Bumps [md-5](https://github.com/RustCrypto/hashes) from 0.10.5 to 0.10.6.
- [Commits](https://github.com/RustCrypto/hashes/compare/md-5-v0.10.5...md-5-v0.10.6)

---
updated-dependencies:
- dependency-name: md-5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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