Bump Microsoft.NET.Test.Sdk from 17.10.0 to 17.11.0 in /src #535

Job	Run time
init / run	18s
build-test-pack (Core) / run	1m 44s
build-test-pack (AutoFakeItEasy) / run	1m 46s
build-test-pack (AutoMoq) / run	1m 58s
build-test-pack (AutoNSubstitute) / run	1m 51s
publish	0s
tag	0s
	7m 37s

Provide feedback