DEP Increase minimum version of silverstripe/framework #166

Job	Run time
CI / Generate matrix	2m 25s
CI / Context	1s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	2m 1s
CI / 8.2 mariadb phpunit all	1m 57s
CI / 8.3 mysql80 phpunit all	2m 5s
CI / 8.1 mysql57 phplinting	1m 52s
CI / 8.1 mysql57 endtoend root	4m 57s
CI / 8.3 mysql80 endtoend root	4m 54s
CI / 8.1 mysql57 js	3m 56s
CI / Dispatch tag patch release	0s
	24m 9s

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