Heroku: Heroku renamed the included-spec fields for Postgres Shield-XL-6 from disk_size and connection_limit to disk and connec…

{"ram":"122 GB","disk_size":"3 TB","connection_limit":"500"} → {"ram":"122 GB","disk":"3 TB","connections":"500"}

Heroku renamed the included-spec fields for Postgres Shield-XL-6 from disk_size and connection_limit to disk and connections. The values were unchanged at 122 GB RAM, 3 TB disk and 500 connections.