Update version of SqlMarshal to fix warnings

This address feedback in #1646

Author: kant2002

benchmarks/Dapper.Tests.Performance/Dapper.Tests.Performance.csproj

@@ -24,7 +24,7 @@
     <PackageReference Include="PetaPoco" Version="5.1.306" />
     <PackageReference Include="RepoDb.SqlServer" Version="1.1.3" />
     <PackageReference Include="ServiceStack.OrmLite.SqlServer" Version="5.10.2" />
-    <PackageReference Include="SqlMarshal" Version="0.1.0" />
+    <PackageReference Include="SqlMarshal" Version="0.2.0" />
     <PackageReference Include="System.Data.SqlClient" Version="4.8.2" />
     <PackageReference Include="System.Data.SQLite" Version="1.0.113.6" />
   </ItemGroup>