[FLINK-18546] Upgrade to Kafka Schema Registry Client 5.5.0 - ASF JIRA

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Release Note:
The flink-avro-confluent-schema-registry module is no longer provided as a fat-jar. You should include its dependencies in your job's fat-jar. Sql-client users can use flink-sql-avro-confluent-schema-registry fat jar.

As of version 1.11, Flink (i.e., flink-avro-confluent-registry) still uses kafka-schema-registry-client in version 4.1.0.

From version 5.5.0 on, the Kafka schema registry client supports resolving of schema references (see https://docs.confluent.io/current/schema-registry/serdes-develop/index.html#referenced-schemas), i.e., schemas that are defined using schemas from other subjects.

Therefore it would be great if Flink could make use of kafka-schema-registry-client in version 5.5.0 or higher in future releases.