Bump Newtonsoft.Json from 13.0.2 to 13.0.3

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 13.0.2 to 13.0.3.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@13.0.2...13.0.3)

---
updated-dependencies:
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Src/SmtpLw/SmtpLw.csproj

@@ -36,7 +36,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.2.9" />
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
   </ItemGroup>
 
 </Project>