Bump elliptic from 6.5.4 to 6.5.7 in /client/web/admin #1754

Job	Run time
Server tests	2m 22s
Library test (js)	3m 6s
Web client test (admin)	1m 10s
Library test (vue)	1m 0s
Web client test (compose)	1m 24s
Web client test (discovery)	1m 34s
Web client test (privacy)	1m 10s
Web client test (reporter)	1m 22s
Web client test (one)	1m 7s
Web client test (workflow)	1m 18s
Send matrix testing notification	0s
	15m 33s

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