Bump micromatch from 4.0.5 to 4.0.8 #506

Job	Run time
CI / Generate matrix	30s
CI / Context	1s
CI / 8.1 prf-low mysql57 phpunit all	2m 26s
CI / Check governance	1s
CI / 8.2 mariadb phpunit all	2m 12s
CI / 8.3 mysql80 phpunit all	2m 29s
CI / 8.1 mysql57 phplinting	1m 31s
CI / 8.1 mysql57 endtoend root	2m 29s
CI / 8.3 mysql80 endtoend root	3m 25s
CI / 8.1 mysql57 js	4m 48s
CI / 8.1 mysql57 doclinting	2m 18s
CI / Dispatch tag patch release	2s
	22m 12s

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