[AVRO-3536] [flink-avro] Union type not inheriting type conversions

[m8719-github]

What is the purpose of the change

Apache Avro 1.11.2 contains an important fix: AVRO-3536
Just want to make sure it makes it into the next Flink release.

Brief change log

Bumped up Apache Avro version to 1.11.2

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): yes
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no

[flinkbot]

CI report:

• Unknown: CANCELED
• 8643ddd Azure: PENDING

Bot commands

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• @flinkbot run azure re-run the last Azure build

[m8719-github]

@flinkbot run azure

[anleib]

flink-avro tests failing due to AVRO-3789
closed, will have to wait until avro 1.11.3