Bump io.confluent:kafka-avro-serializer from 7.7.1 to 7.9.0

Bumps [io.confluent:kafka-avro-serializer](https://github.com/confluentinc/schema-registry) from 7.7.1 to 7.9.0.
- [Commits](confluentinc/schema-registry@v7.7.1...v7.9.0)

---
updated-dependencies:
- dependency-name: io.confluent:kafka-avro-serializer
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ kotlin = "2.0.21"
 ktor = "2.3.12"
 arrow = "1.2.4"
 jackson = "2.17.2"
-confluent = "7.7.1"
+confluent = "7.9.0"
 micrometer = "1.13.6"
 flyway = "10.20.0"
 kotest = "5.9.1"