Update Silverstripe Search Client. Add analytics tags to request object #199

Job	Run time
ci / Generate matrix	11s
ci / Context	3s
ci / 8.5 mysql84 phpunit all	1m 51s
ci / 8.3 mysql80 phplinting	2m 10s
ci / 8.3 prf-low mariadb phpunit all	1m 57s
ci / 8.4 mysql80 phpunit all	2m 22s
ci / Check governance	0s
ci / Dispatch tag patch release	-1s
	8m 33s

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