Bump Erlang/OTP to 22.0.1 in Docker image

Picking up the latest 3.8.0 alpha while at it.

It's time to start stress-testing OTP 22 re docker-library/rabbitmq#336

[#166037004]

deps/rabbitmq_prometheus/Dockerfile

@@ -25,8 +25,8 @@ ENV OPENSSL_SOURCE_SHA256="5c557b023230413dfb0756f3137a13e6d726838ccd1430888ad15
 ENV OPENSSL_PGP_KEY_ID="0x8657ABB260F056B1E5190839D9C4D26D0E604491"
 
 # Use the latest stable Erlang/OTP release - gmake find_latest_otp - https://github.com/erlang/otp/tags
-ENV OTP_VERSION 21.3.8.1
-ENV OTP_SOURCE_SHA256="2aac8e6e16eae2cf7ebee19b07ea7b5931a85763c4ff20186dd37125177f737f"
+ENV OTP_VERSION 22.0.1
+ENV OTP_SOURCE_SHA256="694f133abfca3c7fb8376b223ea484413bcd16b82354f178fba798f37335f163"
 
 # Install dependencies required to build Erlang/OTP from source
 # http://erlang.org/doc/installation_guide/INSTALL.html

deps/rabbitmq_prometheus/Makefile

@@ -1,6 +1,6 @@
 TODAY := $(shell date -u +'%Y.%m.%d')
 # Use the latest alpha RabbitMQ 3.8 release - https://dl.bintray.com/rabbitmq/all-dev/rabbitmq-server/
-BASED_ON_RABBITMQ_VERSION := 3.8.0-alpha.659
+BASED_ON_RABBITMQ_VERSION := 3.8.0-alpha.664
 DOCKER_IMAGE_VERSION := $(BASED_ON_RABBITMQ_VERSION)-$(TODAY)
 # RABBITMQ_VERSION is used in rabbitmq-components.mk to set PROJECT_VERSION
 RABBITMQ_VERSION ?= $(DOCKER_IMAGE_VERSION)
@@ -92,7 +92,7 @@ JQ := /usr/local/bin/jq
 $(JQ):
 	@brew install jq
 
-OTP_CURRENT_STABLE_MAJOR := 21
+OTP_CURRENT_STABLE_MAJOR := 22
 define LATEST_STABLE_OTP_VERSION
 curl --silent --fail https://api.github.com/repos/erlang/otp/git/refs/tags | \
   $(JQ) -r '.[].ref | sub("refs/tags/OTP.{1}";"") | match("^$(OTP_CURRENT_STABLE_MAJOR)[0-9.]+$$") | .string' | \

deps/rabbitmq_prometheus/docker/docker-compose.yml

@@ -13,7 +13,7 @@ volumes:
 services:
   rabbitmq1: &rabbitmq
     # https://hub.docker.com/r/pivotalrabbitmq/rabbitmq-prometheus/tags
-    image: pivotalrabbitmq/rabbitmq-prometheus:3.8.0-alpha.659-2019.05.15
+    image: pivotalrabbitmq/rabbitmq-prometheus:3.8.0-alpha.664-2019.05.20
     networks:
       - "rabbitmq-prometheus"
     ports: