avro

Bump org.apache.thrift:libthrift from 0.19.0 to 0.20.0 in /lang/java (#2819)

Bumps [org.apache.thrift:libthrift](https://github.com/apache/thrift) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/apache/thrift/releases)
- [Changelog](https://github.com/apache/thrift/blob/master/CHANGES.md)
- [Commits](https://github.com/apache/thrift/compare/v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: org.apache.thrift:libthrift
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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