Bump elliptic from 6.5.7 to 6.6.1 #635

Job	Run time
CI / Generate matrix	13s
CI / Context	1s
CI / 8.1 prf-low mysql57 phpunit all	2m 26s
CI / Check governance	0s
CI / 8.2 mariadb phpunit all	1m 54s
CI / 8.3 mysql80 phpunit all	2m 12s
CI / 8.3 mysql84 phpunit all	2m 11s
CI / 8.1 mysql57 phplinting	1m 45s
CI / 8.1 mysql57 endtoend root job1	6m 7s
CI / 8.3 mysql80 endtoend root job1	6m 6s
CI / 8.1 mysql57 endtoend root job2	5m 19s
CI / 8.3 mysql80 endtoend root job2	5m 18s
CI / 8.1 mysql57 js	4m 45s
CI / Dispatch tag patch release	0s
	38m 17s

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