API Update API to reflect changes in silverstripe/cms (#798) #606

Job	Run time
CI / Generate matrix	19s
CI / Context	1s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit blog	2m 8s
CI / 8.3 mysql80 phpunit blog	2m 9s
CI / 8.4 mysql84 phpunit blog	2m 41s
CI / 8.3 mysql80 phplinting	1m 41s
CI / 8.3 mysql80 endtoend root	5m 59s
CI / 8.4 mysql84 endtoend root	5m 15s
CI / 8.3 mysql80 js	3m 43s
CI / Dispatch tag patch release	0s
	23m 57s

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