Bump org.apache.avro:avro in /kafka-e2e-kotlin-sample/customer-service

Bumps org.apache.avro:avro from 1.8.2 to 1.11.3.

---
updated-dependencies:
- dependency-name: org.apache.avro:avro
  dependency-type: direct:production
...

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

Author: dependabot[bot]

kafka-e2e-kotlin-sample/customer-service/pom.xml

@@ -18,7 +18,7 @@
     <properties>
         <java.version>1.8</java.version>
         <kotlin.version>1.3.31</kotlin.version>
-        <avro.version>1.8.2</avro.version>
+        <avro.version>1.11.3</avro.version>
         <confluent.version>5.2.1</confluent.version>
         <spring-cloud.version>2020.0.2</spring-cloud.version>
     </properties>