chore(deps): bump org.apache.avro:avro from 1.9.2 to 1.12.0

Bumps org.apache.avro:avro from 1.9.2 to 1.12.0.

---
updated-dependencies:
- dependency-name: org.apache.avro:avro
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle.kts

@@ -60,7 +60,7 @@ tasks.wrapper {
 
 val moduleName = "io.aiven.kafka.connect.http"
 
-val avroVersion = "1.9.2" // Version 1.9.2 brings Jackson 2.10.2 package for Avro
+val avroVersion = "1.12.0" // Version 1.9.2 brings Jackson 2.10.2 package for Avro
 val confluentPlatformVersion = "6.0.2" // For compatibility tests use version 6.0.2 to match Kafka 2.6.
 // NOTE: Confluent Platform v6.0.3 has a dependency mismatch issue.
 val hamcrestVersion = "2.2"