chore(deps): bump rabbitmq from 4.2.0-management to 4.2.1-management

Bumps rabbitmq from 4.2.0-management to 4.2.1-management.

---
updated-dependencies:
- dependency-name: rabbitmq
  dependency-version: 4.2.1-management
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -1 +1 @@
-FROM rabbitmq:4.2.0-management
+FROM rabbitmq:4.2.1-management