Fix nuget sanitycheck #2795

Job	Run time
linux-github--dotnet-and-newmono	8m 59s
linux-vanilla--newmono-only	4m 0s
linux-vanilla--stockdotnet6-and-newmono	7m 32s
linux-github--dotnet-and-mono	5m 23s
linux-vanilla--stockdotnet6-and-stockmono	7m 36s
linux-vanilla--stockdotnet6-only	6m 17s
linux-vanilla--stockmono-only	6m 50s
macOS--dotnet6-and-mono	28m 17s
macOS--dotnet6-only	1m 45s
macOS--mono-only	4m 30s
windows--dotnet6-and-legacyFramework	8m 48s
windows--dotnet6-only	9m 6s
windows--legacyFramework-only	16m 40s
conventions	0s
snap_pkg	0s
	1h 55m 43s

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