Adding new ap-southeast-5 AWS region

Source commit: 0533972d0dd776a6cf5b9795e1eb8af3ce5dd6dc

source/forms/SiteAdvanced.dfm

@@ -1074,6 +1074,7 @@ object SiteAdvancedDialog: TSiteAdvancedDialog
               'ap-southeast-2'
               'ap-southeast-3'
               'ap-southeast-4'
+              'ap-southeast-5'
               'ca-central-1'
               'ca-west-1'
               'cn-north-1'