Bump software.amazon.msk:aws-msk-iam-auth

Bumps [software.amazon.msk:aws-msk-iam-auth](https://github.com/aws/aws-msk-iam-auth) from 1.1.6 to 2.0.3.
- [Release notes](https://github.com/aws/aws-msk-iam-auth/releases)
- [Commits](aws/aws-msk-iam-auth@v1.1.6...v2.0.3)

---
updated-dependencies:
- dependency-name: software.amazon.msk:aws-msk-iam-auth
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

data-prepper-plugins/kafka-plugins/build.gradle

@@ -44,7 +44,7 @@ dependencies {
     implementation 'software.amazon.awssdk:auth'
     implementation 'software.amazon.awssdk:kafka'
     implementation 'software.amazon.awssdk:kms'
-    implementation 'software.amazon.msk:aws-msk-iam-auth:1.1.6'
+    implementation 'software.amazon.msk:aws-msk-iam-auth:2.0.3'
     implementation 'software.amazon.glue:schema-registry-serde:1.1.15'
     implementation 'com.amazonaws:aws-java-sdk-glue:1.12.506'
     implementation 'io.confluent:kafka-json-schema-serializer:7.4.0'