Update rabbitmq

Changes:

- https://github.com/docker-library/rabbitmq/commit/fcb9d26: Update 3.8-rc to 3.8.15-rc.3

library/rabbitmq

@@ -4,22 +4,22 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/rabbitmq.git
 
-Tags: 3.8.15-rc.2, 3.8-rc
+Tags: 3.8.15-rc.3, 3.8-rc
 Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 8983f3a2000b26a5658fccc99ee9fa3d66760d76
+GitCommit: fcb9d26a671581a665e257aa8b7a1ea0dff5344a
 Directory: 3.8-rc/ubuntu
 
-Tags: 3.8.15-rc.2-management, 3.8-rc-management
+Tags: 3.8.15-rc.3-management, 3.8-rc-management
 Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
 GitCommit: 7e63843da6bfb191ddee6dbe3dd7ec0df36ae70b
 Directory: 3.8-rc/ubuntu/management
 
-Tags: 3.8.15-rc.2-alpine, 3.8-rc-alpine
+Tags: 3.8.15-rc.3-alpine, 3.8-rc-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 8983f3a2000b26a5658fccc99ee9fa3d66760d76
+GitCommit: fcb9d26a671581a665e257aa8b7a1ea0dff5344a
 Directory: 3.8-rc/alpine
 
-Tags: 3.8.15-rc.2-management-alpine, 3.8-rc-management-alpine
+Tags: 3.8.15-rc.3-management-alpine, 3.8-rc-management-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
 GitCommit: 7e63843da6bfb191ddee6dbe3dd7ec0df36ae70b
 Directory: 3.8-rc/alpine/management