problem: project reference old version of System.ValueTuple

Author: somdoron

src/NetMQ/NetMQ.csproj

@@ -36,12 +36,12 @@
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
     <PackageReference Include="System.ServiceModel.Primitives" Version="4.4.0" />
-    <PackageReference Include="System.ValueTuple" Version="4.4.0" />
+    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.1' ">
     <PackageReference Include="System.ServiceModel.Primitives" Version="4.4.0" />
-    <PackageReference Include="System.ValueTuple" Version="4.4.0" />
+    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">