chore(deps): bump com.amazonaws:amazon-kinesis-producer

Bumps [com.amazonaws:amazon-kinesis-producer](https://github.com/awslabs/amazon-kinesis-producer) from 0.15.3 to 0.15.4.
- [Release notes](https://github.com/awslabs/amazon-kinesis-producer/releases)
- [Changelog](https://github.com/awslabs/amazon-kinesis-producer/blob/master/CHANGELOG.md)
- [Commits](awslabs/amazon-kinesis-producer@v0.15.3...v0.15.4)

---
updated-dependencies:
- dependency-name: com.amazonaws:amazon-kinesis-producer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

james-publisher-aws-kinesis/build.gradle

@@ -26,6 +26,6 @@ assemble.dependsOn(shadowJar)
 dependencies {
     implementation project(':james-agent-common')
     implementation group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: versions.jackson
-    implementation group: 'com.amazonaws', name: 'amazon-kinesis-producer', version: '0.15.3'
+    implementation group: 'com.amazonaws', name: 'amazon-kinesis-producer', version: '0.15.4'
     implementation group: 'org.apache.logging.log4j', name: 'log4j-jcl', version: '2.19.0'
 }