API Update code to reflect changes in silverstripe/admin (#1504) #1003

Job	Run time
CI / Context	1s
CI / Generate matrix	19s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit all	2m 44s
CI / 8.3 mysql80 phpunit all	3m 2s
CI / 8.3 mysql80 phplinting	2m 0s
CI / 8.3 mysql80 endtoend root job1	8m 46s
CI / 8.3 mysql80 endtoend root job2	8m 59s
CI / 8.3 mysql80 endtoend root job3	7m 5s
CI / 8.3 mysql80 js	4m 38s
CI / Dispatch tag patch release	2s
	37m 37s

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