Update rabbitmq

Changes:

- https://github.com/docker-library/rabbitmq/commit/56e55ca: Update to 3.7.15-beta.1, Erlang/OTP 21.3.8, OpenSSL 1.1.1b
- https://github.com/docker-library/rabbitmq/commit/fbc4fec: Update to 3.8.0-beta.3, Erlang/OTP 21.3.8, OpenSSL 1.1.1b
- https://github.com/docker-library/rabbitmq/commit/6f98f87: Update to 3.7.14, Erlang/OTP 21.3.8, OpenSSL 1.1.1b

library/rabbitmq

@@ -6,7 +6,7 @@ GitRepo: https://github.com/docker-library/rabbitmq.git
 
 Tags: 3.8.0-beta.3, 3.8-rc
 Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 5a60b96907bd967e57d1b6611be811d000c2a1b2
+GitCommit: fbc4fecb9b5139c0ae22b512d75a948bce4b93e9
 Directory: 3.8-rc/ubuntu
 
 Tags: 3.8.0-beta.3-management, 3.8-rc-management
@@ -16,7 +16,7 @@ Directory: 3.8-rc/ubuntu/management
 
 Tags: 3.8.0-beta.3-alpine, 3.8-rc-alpine
 Architectures: amd64, arm32v6, arm64v8, i386, ppc64le, s390x
-GitCommit: 5a60b96907bd967e57d1b6611be811d000c2a1b2
+GitCommit: fbc4fecb9b5139c0ae22b512d75a948bce4b93e9
 Directory: 3.8-rc/alpine
 
 Tags: 3.8.0-beta.3-management-alpine, 3.8-rc-management-alpine
@@ -24,9 +24,29 @@ Architectures: amd64, arm32v6, arm64v8, i386, ppc64le, s390x
 GitCommit: 3a5957b93e31661739a9018bc2ae5d20f1bfae59
 Directory: 3.8-rc/alpine/management
 
+Tags: 3.7.15-beta.1, 3.7-rc
+Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
+GitCommit: 56e55cad646a496e95273e8c500b24edab2ebfe0
+Directory: 3.7-rc/ubuntu
+
+Tags: 3.7.15-beta.1-management, 3.7-rc-management
+Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
+GitCommit: f22c0b266cfeb8cb6d776f9e6a961908c2557ad3
+Directory: 3.7-rc/ubuntu/management
+
+Tags: 3.7.15-beta.1-alpine, 3.7-rc-alpine
+Architectures: amd64, arm32v6, arm64v8, i386, ppc64le, s390x
+GitCommit: 56e55cad646a496e95273e8c500b24edab2ebfe0
+Directory: 3.7-rc/alpine
+
+Tags: 3.7.15-beta.1-management-alpine, 3.7-rc-management-alpine
+Architectures: amd64, arm32v6, arm64v8, i386, ppc64le, s390x
+GitCommit: da06cbdbe9e89305b2650a782af06f96004a894e
+Directory: 3.7-rc/alpine/management
+
 Tags: 3.7.14, 3.7, 3, latest
 Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 4d62051f86b7d015a3092d8d5e26edc49bcb0088
+GitCommit: 6f98f87ceb0ad2fb3105b69d7253bd1e672981fd
 Directory: 3.7/ubuntu
 
 Tags: 3.7.14-management, 3.7-management, 3-management, management
@@ -36,7 +56,7 @@ Directory: 3.7/ubuntu/management
 
 Tags: 3.7.14-alpine, 3.7-alpine, 3-alpine, alpine
 Architectures: amd64, arm32v6, arm64v8, i386, ppc64le, s390x
-GitCommit: 4d62051f86b7d015a3092d8d5e26edc49bcb0088
+GitCommit: 6f98f87ceb0ad2fb3105b69d7253bd1e672981fd
 Directory: 3.7/alpine
 
 Tags: 3.7.14-management-alpine, 3.7-management-alpine, 3-management-alpine, management-alpine