Node.js CI

Bump socket.io from 2.1.1 to 2.5.0 #159

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Run time

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Job	Run time
Build (16.x, ubuntu-20.04)	40s
Build (16.x, windows-2019)	43s
Build (14.x, ubuntu-20.04)	31s
Build (14.x, windows-2019)	41s
Build (12.x, ubuntu-20.04)	30s
Build (12.x, windows-2019)	44s
Build (10.x, ubuntu-20.04)	30s
Build (10.x, windows-2019)	38s
Build (8.x, ubuntu-20.04)	31s
Build (8.x, windows-2019)	43s
Build (6.x, ubuntu-20.04)	47s
Build (6.x, windows-2019)	42s
Build (4.x, ubuntu-20.04)	38s
Build (4.x, windows-2019)	42s
	9m 0s