Bump com.rabbitmq:amqp-client from 5.20.0 to 5.21.0

Bumps [com.rabbitmq:amqp-client](https://github.com/rabbitmq/rabbitmq-java-client) from 5.20.0 to 5.21.0.
- [Release notes](https://github.com/rabbitmq/rabbitmq-java-client/releases)
- [Commits](rabbitmq/rabbitmq-java-client@v5.20.0...v5.21.0)

---
updated-dependencies:
- dependency-name: com.rabbitmq:amqp-client
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle

@@ -42,5 +42,5 @@ dependencies {
 	implementation "org.springframework.security:spring-security-oauth2-jose:$springSecurityVersion"
 	implementation "org.springframework.security:spring-security-config:$springSecurityVersion"
 	implementation "io.pivotal.cfenv:java-cfenv-boot-pivotal-sso:$cfEnvSsoVersion"
-	implementation "com.rabbitmq:amqp-client:5.20.0"
+	implementation "com.rabbitmq:amqp-client:5.21.0"
 }