Bump the xunit group across 9 directories with 7 updates #652

Job	Run time
init / run	15s
build-test-pack (AutoFakeItEasy) / run	3m 20s
build-test-pack (Core) / run	2m 35s
build-test-pack (AutoMoq) / run	3m 9s
build-test-pack (AutoNSubstitute) / run	2m 25s
publish	0s
tag	0s
	11m 44s

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