[Snyk] Upgrade nan from 2.19.0 to 2.20.0 #208

Job	Run time
lint	16s
build-ubuntu (18)	2m 15s
build-ubuntu (20)	3m 46s
build-ubuntu (22)	3m 21s
test-ee	1m 22s
test-lowest-supported-server	1m 31s
test-ce (18)	1m 42s
test-ce-latest-release	0s
test-ce (20)	1m 47s
test-typescript (20)	26s
test-ce (22)	1m 41s
test-valgrind (20)	2m 26s
	20m 33s

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