avro

Bump zerocopy from 0.6.1 to 0.6.3 in /lang/rust (#2428)

Bumps [zerocopy](https://github.com/google/zerocopy) from 0.6.1 to 0.6.3.
- [Commits](https://github.com/google/zerocopy/commits)

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

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