DEP Limit PHP support for CMS 6 #604

Job	Run time
ci / Generate matrix	41s
ci / Context	1s
ci / Check governance	0s
ci / 8.3 prf-low mysql57 phpunit all	4m 47s
ci / 8.3 mariadb phpunit all	4m 40s
ci / 8.3 mysql80 phpunit all	6m 26s
ci / 8.3 mysql57 phplinting	1m 54s
ci / 8.3 mysql57 endtoend root job1	6m 9s
ci / 8.3 mysql80 endtoend root job1	6m 39s
ci / 8.3 mysql57 endtoend root job2	7m 41s
ci / 8.3 mysql80 endtoend root job2	8m 1s
ci / 8.3 mysql57 js	7m 3s
ci / 8.3 mysql57 doclinting	3m 6s
ci / Dispatch tag patch release	0s
	57m 8s

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