Update SpanJson nuget package (#4424)

Update SpanJson nuget package

frameworks/CSharp/aspnetcore/Benchmarks/Benchmarks.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="MySqlConnector" Version="0.48.2" />
     <PackageReference Include="Npgsql" Version="4.0.4" />
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="2.2.0" />
-    <PackageReference Include="SpanJson" Version="1.3.3" />
+    <PackageReference Include="SpanJson" Version="2.0.4" />
     <PackageReference Include="Utf8Json" Version="1.3.7" />
   </ItemGroup>
 </Project>