Bump MassTransit and Microsoft.Extensions.Hosting.Abstractions (#445) #165

Job	Run time
build (windows-latest)	13m 41s
build (ubuntu-latest)	8m 52s
sign	55s
test-reporting	6s
publish-coverage / publish-coverage	31s
publish-nuget	12s
publish-azure-artifacts	1m 6s
	25m 23s

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