Bump Newtonsoft.Json from 12.0.3 to 13.0.1 in /backend/mapservice (#1122

)

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 12.0.3 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@12.0.3...13.0.1)

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

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backend/mapservice/packages.config

@@ -20,7 +20,7 @@
   <package id="Microsoft.CSharp" version="4.7.0" targetFramework="net452" />
   <package id="Microsoft.Net.Compilers" version="3.7.0" targetFramework="net452" developmentDependency="true" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net452" />
-  <package id="Newtonsoft.Json" version="12.0.3" targetFramework="net452" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net452" />
   <package id="NPOI" version="2.5.1" targetFramework="net452" />
   <package id="NReco.PdfGenerator" version="1.2.0" targetFramework="net452" />
   <package id="PDFsharp" version="1.50.5147" targetFramework="net452" />