docker-compose: Switch rabbitmq image to the latest 3.12 point release.

This aligns better with the version of rabbitmq-server (3.12.1) that
is in Ubuntu 24.04.  Choosing the latest point-release of that same
series addresses bugs while maintaining feature parity.

docker-compose.yml

@@ -1,4 +1,3 @@
-version: "2"
 services:
   database:
     image: "zulip/zulip-postgresql:14"
@@ -28,7 +27,7 @@ services:
       MEMCACHED_SASL_PWDB: "/home/memcache/memcached-sasl-db"
       MEMCACHED_PASSWORD: "REPLACE_WITH_SECURE_MEMCACHED_PASSWORD"
   rabbitmq:
-    image: "rabbitmq:3.7.7"
+    image: "rabbitmq:3.12.14"
     restart: unless-stopped
     environment:
       RABBITMQ_DEFAULT_USER: "zulip"

kubernetes/manual/zulip-rc.yml

@@ -56,7 +56,7 @@ spec:
               cpu: 75m
               memory: 768Mi
         - name: rabbitmq
-          image: rabbitmq:3.7.7
+          image: rabbitmq:3.12.14
           resources:
             limits:
               cpu: 75m