use REDIS_TLS_URL

recently there were redis upgrades on heroku and apparently the new version requires REDIS_TLS_URL instead of REDIS_URL

Author: andrzejkrzywda

rails_application/config/cable.yml

@@ -8,5 +8,5 @@ test:
 
 production:
   adapter: redis
-  url: <%= ENV.fetch("REDIS_URL") %>
+  url: <%= ENV.fetch("REDIS_TLS_URL") %>
   channel_prefix: ecommerce_production