odin: rename backup notifications key arn and make optional#71

matt-mercer wants to merge 1 commit intomainNHSDigital/terraform-aws-backup:mainfrom

mm-odin-rename-notifications-kms-key-arn-variableNHSDigital/terraform-aws-backup:mm-odin-rename-notifications-kms-key-arn-variableCopy head branch name to clipboard