avro

Bump strum from 0.26.2 to 0.26.3 in /lang/rust (#2971)

Bumps [strum](https://github.com/Peternator7/strum) from 0.26.2 to 0.26.3.
- [Release notes](https://github.com/Peternator7/strum/releases)
- [Changelog](https://github.com/Peternator7/strum/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Peternator7/strum/compare/v0.26.2...v0.26.3)

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

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