Bump Newtonsoft.Json from 12.0.2 to 13.0.2 in /src/DevKit

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 12.0.2 to 13.0.2.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@12.0.2...13.0.2)

---
updated-dependencies:
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
...

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

src/DevKit/DevKit - Backup.csproj

@@ -53,7 +53,7 @@
     <PackageReference Include="Microsoft.Bcl" Version="1.1.10" />
     <PackageReference Include="Microsoft.Bcl.Async" Version="1.0.168" />
     <PackageReference Include="Microsoft.Bcl.Build" Version="1.0.21" />
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.2" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
     <PackageReference Include="Nito.AsyncEx" Version="4.0.1" />
     <PackageReference Include="SuperSocket.ClientEngine.Core" Version="0.10.0" />
     <PackageReference Include="SuperWebSocket" Version="0.9.0.2" />