Update rabbitmq

Changes:

- docker-library/rabbitmq@9fec503: Update 4.2-rc to 4.2.0-beta.2
- docker-library/rabbitmq@2fa8f8a: Merge pull request docker-library/rabbitmq#770 from infosiftr/generic-aliases
- docker-library/rabbitmq@423cdaa: Make alias-choosing code generic so GA can be fully automated

Author: docker-library-bot

library/rabbitmq

@@ -1,26 +1,26 @@
-# this file is generated via https://github.com/docker-library/rabbitmq/blob/01055a3ed6f0a7a40d4ff1d17d3f0758039e431f/generate-stackbrew-library.sh
+# this file is generated via https://github.com/docker-library/rabbitmq/blob/423cdaa94f7e3dc15462ae62487fa216e65d7c6a/generate-stackbrew-library.sh
 
 Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/rabbitmq.git
 Builder: buildkit
 
-Tags: 4.2.0-beta.1, 4.2-rc
+Tags: 4.2.0-beta.2, 4.2-rc
 Architectures: amd64, arm32v7, arm64v8, ppc64le, riscv64, s390x
-GitCommit: aaf82bfff4fd5ee6c98ec4ce7815e7e580066892
+GitCommit: 9fec503f1e0f36c21a3d765828a55f2831140031
 Directory: 4.2-rc/ubuntu
 
-Tags: 4.2.0-beta.1-management, 4.2-rc-management
+Tags: 4.2.0-beta.2-management, 4.2-rc-management
 Architectures: amd64, arm32v7, arm64v8, ppc64le, riscv64, s390x
 GitCommit: aaf82bfff4fd5ee6c98ec4ce7815e7e580066892
 Directory: 4.2-rc/ubuntu/management
 
-Tags: 4.2.0-beta.1-alpine, 4.2-rc-alpine
+Tags: 4.2.0-beta.2-alpine, 4.2-rc-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
-GitCommit: aaf82bfff4fd5ee6c98ec4ce7815e7e580066892
+GitCommit: 9fec503f1e0f36c21a3d765828a55f2831140031
 Directory: 4.2-rc/alpine
 
-Tags: 4.2.0-beta.1-management-alpine, 4.2-rc-management-alpine
+Tags: 4.2.0-beta.2-management-alpine, 4.2-rc-management-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
 GitCommit: aaf82bfff4fd5ee6c98ec4ce7815e7e580066892
 Directory: 4.2-rc/alpine/management