Array.CreateInstance IL3050 suppression justified by closed #1638

[KalleOlaviNiemitalo]

#1656 suppressed warning IL3050 about Array.CreateInstance, using #1638 as the justification:

command-line-api/src/System.CommandLine/Binding/ArgumentConverter.DefaultValues.cs

Lines 18 to 20 in 350a618

	[UnconditionalSuppressMessage("ReflectionAnalysis", "IL3050", Justification = "https://github.com/dotnet/command-line-api/issues/1638")]
	private static Array CreateArray(Type itemType, int capacity)
	=> Array.CreateInstance(itemType, capacity);

However, #1638 has been closed already, so the justification is no longer valid.