API Update code to reflect changes in silverstripe/admin #967

Job	Run time
CI / Generate matrix	14s
CI / Context	1s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	2m 32s
CI / 8.3 mysql80 phpunit all	2m 50s
CI / 8.3 mysql80 phplinting	1m 24s
CI / 8.3 mysql80 endtoend root job1	32m 46s
CI / 8.3 mysql80 endtoend root job2	22m 2s
CI / 8.3 mysql80 endtoend root job3	15m 29s
CI / 8.3 mysql80 js	3m 37s
CI / Dispatch tag patch release	0s
	1h 20m 55s

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