Remove Unused AWS KMS Dependency (elastic#43671) (elastic#43679)

* We don't make use of KMS at the moment, no need to have this dependency here

Author: original-brownbear

plugins/repository-s3/build.gradle

@@ -33,7 +33,6 @@ versions << [
 
 dependencies {
   compile "com.amazonaws:aws-java-sdk-s3:${versions.aws}"
-  compile "com.amazonaws:aws-java-sdk-kms:${versions.aws}"
   compile "com.amazonaws:aws-java-sdk-core:${versions.aws}"
   compile "com.amazonaws:jmespath-java:${versions.aws}"
   compile "org.apache.httpcomponents:httpclient:${versions.httpclient}"