Bump Newtonsoft.Json from 12.0.3 to 13.0.1 in /GUI (#15)

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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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

GUI/GUI.csproj

@@ -314,7 +314,7 @@
       <Version>6.1.0</Version>
     </PackageReference>
     <PackageReference Include="Newtonsoft.Json">
-      <Version>12.0.3</Version>
+      <Version>13.0.1</Version>
     </PackageReference>
     <PackageReference Include="System.Interactive.Async">
       <Version>4.1.1</Version>