avro

Bump reload4j from 1.2.19 to 1.2.21 in /lang/java (#1700)

Bumps [reload4j](https://github.com/qos-ch/reload4j) from 1.2.19 to 1.2.21.
- [Release notes](https://github.com/qos-ch/reload4j/releases)
- [Commits](https://github.com/qos-ch/reload4j/compare/v_1.2.19...v_1.2.21)

---
updated-dependencies:
- dependency-name: ch.qos.reload4j:reload4j
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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