avro

Bump ctor from 0.2.6 to 0.2.7 in /lang/rust (#2770)

Bumps [ctor](https://github.com/mmastrac/rust-ctor) from 0.2.6 to 0.2.7.
- [Commits](https://github.com/mmastrac/rust-ctor/commits)

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

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