Update package.nuspec

Author: eben-roux

Shuttle.Core.Threading/.package/package.nuspec

@@ -18,7 +18,7 @@
 		<dependencies>
       <dependency id="Microsoft.Extensions.Options" version="8.0.2" />
       <dependency id="Shuttle.Core.Contract" version="20.0.0" />
-      <dependency id="Shuttle.Core.Reflection" version="13.0.0" />
+      <dependency id="Shuttle.Core.Reflection" version="20.0.0" />
 		</dependencies>
 	</metadata>
 	<files>