Build and Test VSCode extension

Fix missed liberty-lemminx version update to 2.3.1 #8

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Run time

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Job	Run time
Build Plugin (mac, latest)	7m 31s
Build Plugin (linux, latest)	19m 10s
Build Plugin (linux, previous)	19m 26s
Build Plugin (mac, previous)	7m 50s
	53m 57s