Upgraded MailKit nuget package

Author: stidsborg

Samples/Sample.ConsoleApp/Sample.ConsoleApp.csproj

@@ -15,7 +15,7 @@
     </ItemGroup>
 
     <ItemGroup>
-      <PackageReference Include="MailKit" Version="4.5.0" />
+      <PackageReference Include="MailKit" Version="4.6.0" />
       <PackageReference Include="Serilog" Version="3.1.1" />
     </ItemGroup>