avro

Bump quote from 1.0.20 to 1.0.21 in /lang/rust (#1805)

Bumps [quote](https://github.com/dtolnay/quote) from 1.0.20 to 1.0.21.
- [Release notes](https://github.com/dtolnay/quote/releases)
- [Commits](https://github.com/dtolnay/quote/compare/1.0.20...1.0.21)

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

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