API Update code to reflect changes in silverstripe/cms (#1356) #852

Job	Run time
CI / Generate matrix	21s
CI / Context	1s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit all	4m 9s
CI / 8.3 mysql80 phpunit all	4m 25s
CI / 8.4 mysql84 phpunit all	4m 18s
CI / 8.3 mysql80 phplinting	2m 15s
CI / 8.3 mysql80 endtoend root	6m 8s
CI / 8.4 mysql84 endtoend root	5m 22s
CI / 8.3 mysql80 js	4m 13s
CI / 8.3 mysql80 doclinting	2m 50s
CI / Dispatch tag patch release	1s
	34m 4s

Provide feedback