Bump Newtonsoft.Json from 9.0.1 to 12.0.3

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 9.0.1 to 12.0.3.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@9.0.1...12.0.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

src/json-ld.net/json-ld.net.csproj

@@ -19,7 +19,7 @@ Implements the W3C JSON-LD 1.0 standard.</Description>
     <GenerateAssemblyProductAttribute>false</GenerateAssemblyProductAttribute>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="9.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'net40-client' ">
     <Reference Include="System" />