Update kafka-avro-serializer to 7.7.0 in series/3.x

[scala-steward]

About this PR

📦 Updates io.confluent:kafka-avro-serializer from 7.6.2 to 7.7.0

📜 GitHub Release Notes - Version Diff

Usage

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⚙ Adjust 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" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequests = { frequency = "30 days" }, dependency = { groupId = "io.confluent", artifactId = "kafka-avro-serializer" } }] ```

^{labels: library-update, early-semver-minor, semver-spec-minor, commit-count:1}

[erikvanoosten]

See also #1344, IMHO we should avoid Confluent's version because it is only available from their maven repository.