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Update Microsoft.NET.Test.Sdk requirement from 17.7.* to 17.8.* #25

Job	Run time
inspect-code (ubuntu-latest)	2m 13s
cleanup-code (ubuntu-latest)	1m 19s
build-and-test (ubuntu-latest)	1m 18s
inspect-code (windows-latest)	5m 57s
build-and-test (windows-latest)	7m 30s
inspect-code (macos-latest)	4m 19s
build-and-test (macos-latest)	2m 7s
cleanup-code (windows-latest)	6m 0s
cleanup-code (macos-latest)	2m 45s
publish	4s
	33m 32s

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