Update dependency com.rabbitmq:amqp-client to v5.21.0 (#60)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

settings.gradle.kts

@@ -63,7 +63,7 @@ dependencyResolutionManagement {
          val jedis = "4.4.4"
          library("jedis", "redis.clients:jedis:$jedis")
 
-         library("rabbitmq", "com.rabbitmq:amqp-client:5.20.0")
+         library("rabbitmq", "com.rabbitmq:amqp-client:5.21.0")
          library("dbcp2", "org.apache.commons:commons-dbcp2:2.11.0")
          library("pulsar-client", "org.apache.pulsar:pulsar-client:2.11.2")