Bump io.confluent:kafka-avro-serializer from 7.5.3 to 7.6.0

Bumps [io.confluent:kafka-avro-serializer](https://github.com/confluentinc/schema-registry) from 7.5.3 to 7.6.0.
- [Commits](https://github.com/confluentinc/schema-registry/commits)

---
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]>

build.gradle.kts

@@ -22,7 +22,7 @@ val jacksonVersion = "2.16.1"
 val postgresEmbeddedVersion = "1.0.2"
 val kafkaVersion = "3.6.0"
 val avroVersion = "1.11.3"
-val confluentVersion = "7.5.3"
+val confluentVersion = "7.6.0"
 val brukernotifikasjonerSchemaVersion = "2.5.1"
 val kotlinVersion = "1.9.22"