Bump elliptic from 6.5.4 to 6.6.1 #13147

Job	Run time
Build Firestore	6m 57s
Test Firestore Compatible	5m 23s
Test Firestore Compatible on Firefox	6m 3s
Test Firestore (test:browser)	8m 16s
Test Nightly Firestore with Chrome	0s
Test Firestore (test:travis)	3m 47s
Test Firestore Compatible on Webkit	4m 45s
Test Firestore (test:lite:browser)	1m 37s
Test Firestore on Firefox (test:browser)	8m 56s
Test Firestore (test:browser:prod:nameddb)	8m 32s
Test Firestore on Firefox (test:travis)	3m 51s
Test Firestore on Webkit (test:browser)	12m 35s
Test Firestore (test:lite:browser:nameddb)	1m 35s
Test Firestore on Firefox (test:lite:browser)	1m 51s
Test Firestore on Webkit (test:lite:browser)	2m 20s
Test Firestore on Firefox (test:browser:prod:nameddb)	8m 34s
Test Firestore on Webkit (test:browser:prod:nameddb)	14m 25s
Test Firestore on Firefox (test:lite:browser:nameddb)	1m 42s
Test Firestore on Webkit (test:lite:browser:nameddb)	2m 2s
Check all required tests results	1s
	1h 43m 12s

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