build(deps): bump rabbitmq in /kubernetes/rabbitmq

Bumps rabbitmq from 3.13.7-management-alpine to 4.0.1-management-alpine.

---
updated-dependencies:
- dependency-name: rabbitmq
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

kubernetes/rabbitmq/Dockerfile

@@ -1,4 +1,4 @@
-FROM rabbitmq:3.13.7-management-alpine
+FROM rabbitmq:4.0.1-management-alpine
 ARG BUILD_DATE
 ARG VCS_REF