Bump Apache Avro to 1.9.2

[Fokko]

Bugfixes that where discovered in other projects

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This PR has:

• been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever it would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths.
• added integration tests.
• been tested in a test Druid cluster.

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Key changed/added classes in this PR

• MyFoo
• OurBar
• TheirBaz

[ccaominh]

Looks like another entry needs to be added to licenses.yaml: https://travis-ci.org/apache/druid/jobs/652946017#L2978

[Fokko]

Thanks @ccaominh Missed that one