[renovate] Update rabbitmq Docker tag to v4

See merge request danet/gosdn!1034

Co-authored-by: Renovate Bot <renovate@danet.fbi.h-da.de>

.gitlab/ci/.test.yml

@@ -16,7 +16,7 @@ integration-test-gosdn:
     services:
       - name: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/mongo:7
         alias: mongo
-      - name: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/rabbitmq:3-management
+      - name: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/rabbitmq:4-management
         alias: rabbitmq
         variables:
           HEALTHCHECK_TCP_PORT: "5672"