Fix nuget sanitycheck #2790

Job	Run time
linux-vanilla--stockdotnet6-and-newmono	6m 24s
linux-github--dotnet-and-newmono	9m 8s
linux-github--dotnet-and-mono	5m 38s
linux-vanilla--newmono-only	3m 44s
linux-vanilla--stockdotnet6-and-stockmono	7m 21s
linux-vanilla--stockdotnet6-only	6m 54s
linux-vanilla--stockmono-only	7m 51s
macOS--dotnet6-and-mono	21m 11s
macOS--dotnet6-only	2m 23s
macOS--mono-only	6m 3s
windows--dotnet6-and-legacyFramework	8m 36s
windows--dotnet6-only	7m 52s
windows--legacyFramework-only	17m 0s
conventions	0s
snap_pkg	0s
	1h 50m 5s

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