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Update to setup-nim-action@v2 #2292

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Run time

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Job	Run time
build (windows-latest, 1.4.x)	6m 56s
build (ubuntu-latest, 1.4.x)	4m 11s
build (ubuntu-latest, stable)	5m 57s
build (windows-latest, stable)	11m 20s
	28m 24s