Update rabbitmq

Changes:

- https://github.com/docker-library/rabbitmq/commit/75fc0de: Update to 3.7.20-rc.1, Erlang/OTP 22.1.3, OpenSSL 1.1.1d

library/rabbitmq

@@ -44,22 +44,22 @@ Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
 GitCommit: af5f6ff9a3916d89be6d190d562d247ae12ffa73
 Directory: 3.8/alpine/management
 
-Tags: 3.7.20-beta.1, 3.7-rc
+Tags: 3.7.20-rc.1, 3.7-rc
 Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 1e090d573910c57cc203c4f0b1327f524107ced5
+GitCommit: 75fc0deff117e3cd15a60c98d7d1d030a971b5ce
 Directory: 3.7-rc/ubuntu
 
-Tags: 3.7.20-beta.1-management, 3.7-rc-management
+Tags: 3.7.20-rc.1-management, 3.7-rc-management
 Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
 GitCommit: f22c0b266cfeb8cb6d776f9e6a961908c2557ad3
 Directory: 3.7-rc/ubuntu/management
 
-Tags: 3.7.20-beta.1-alpine, 3.7-rc-alpine
+Tags: 3.7.20-rc.1-alpine, 3.7-rc-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 1e090d573910c57cc203c4f0b1327f524107ced5
+GitCommit: 75fc0deff117e3cd15a60c98d7d1d030a971b5ce
 Directory: 3.7-rc/alpine
 
-Tags: 3.7.20-beta.1-management-alpine, 3.7-rc-management-alpine
+Tags: 3.7.20-rc.1-management-alpine, 3.7-rc-management-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
 GitCommit: da06cbdbe9e89305b2650a782af06f96004a894e
 Directory: 3.7-rc/alpine/management