Bump org.testcontainers:rabbitmq from 1.20.6 to 1.21.0 (#344)

Bumps [org.testcontainers:rabbitmq](https://github.com/testcontainers/testcontainers-java) from 1.20.6 to 1.21.0.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.6...1.21.0)

---
updated-dependencies:
- dependency-name: org.testcontainers:rabbitmq
  dependency-version: 1.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -32,7 +32,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.version>3.5.4</maven.version>
         <java.version>11</java.version>
-        <testcontainers.version>1.20.6</testcontainers.version>
+        <testcontainers.version>1.21.0</testcontainers.version>
     </properties>
 
     <build>