Bump the xunit group across 9 directories with 2 updates #569

Job	Run time
init / run	29s
build-test-pack (AutoFakeItEasy) / run	1m 52s
build-test-pack (AutoNSubstitute) / run	1m 57s
build-test-pack (Core) / run	1m 49s
build-test-pack (AutoMoq) / run	1m 53s
publish	0s
tag	0s
	8m 0s

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