Merge branch '6.3' into 6 #922

Job	Run time
CI / Context	1s
CI / Generate matrix	12s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	4m 23s
CI / 8.2 mariadb phpunit all	1m 34s
CI / 8.3 mysql80 phpunit all	1m 8s
CI / 8.3 mysql84 phpunit all	1m 6s
CI / 8.1 mysql57 phplinting	1m 23s
CI / 8.1 mysql57 endtoend root	2m 18s
CI / 8.3 mysql80 endtoend root	2m 32s
CI / 8.1 mysql57 js	1m 9s
CI / 8.1 mysql57 doclinting	1m 24s
CI / Dispatch tag patch release	0s
	17m 11s

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