Update kafka-avro-serializer to 6.1.0

[scala-steward]

Updates io.confluent:kafka-avro-serializer from 6.0.1 to 6.1.0.

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "io.confluent", artifactId = "kafka-avro-serializer" } ]

labels: library-update, semver-minor