Bump io.confluent:kafka-avro-serializer from 5.3.0 to 7.6.0

Bumps [io.confluent:kafka-avro-serializer](https://github.com/confluentinc/schema-registry) from 5.3.0 to 7.6.0.
- [Commits](confluentinc/schema-registry@v5.3.0...v7.6.0)

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

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

build.gradle.kts

@@ -17,7 +17,7 @@ dependencies {
 
     implementation("com.github.navikt:rapids-and-rivers:2022.02.08-20.42.8e24a34a2ecd")
     implementation("org.apache.avro:avro:1.11.0")
-    implementation("io.confluent:kafka-avro-serializer:5.3.0")
+    implementation("io.confluent:kafka-avro-serializer:7.6.0")
     implementation("io.github.microutils:kotlin-logging:2.1.21")
     implementation("com.natpryce:konfig:1.6.10.0")