Bump Newtonsoft.Json from 12.0.3 to 13.0.2 in /Src/TestApp

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 12.0.3 to 13.0.2.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@12.0.3...13.0.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Src/MongoLinqPlusPlus/MongoLinqPlusPlus.csproj

@@ -10,6 +10,6 @@
     <PackageReference Include="mongocsharpdriver" Version="2.10.3" />
     <PackageReference Include="MongoDB.Bson" Version="2.10.3" />
     <PackageReference Include="MongoDB.Driver" Version="2.10.3" />
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
   </ItemGroup>
 </Project>

Src/TestApp/TestApp.csproj

@@ -9,6 +9,6 @@
     <ProjectReference Include="..\UnitTests\UnitTests.csproj" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
   </ItemGroup>
 </Project>