Update Microsoft.CSharp nuget to 4.7.0

Author: Sébastien Geiser

CodingSeb.ExpressionEvaluator/CodingSeb.ExpressionEvaluator.csproj

@@ -34,7 +34,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.CSharp" Version="4.5.0" />
+    <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="System.Dynamic.Runtime" Version="4.3.0" />
   </ItemGroup>
   <ItemGroup>