Bump newtonsoft.json and dotnetrdf in /dotnet

Bumps [newtonsoft.json](https://github.com/JamesNK/Newtonsoft.Json) and [dotnetrdf](https://github.com/dotnetrdf/dotnetrdf). These dependencies needed to be updated together.

Updates `newtonsoft.json` from 13.0.3 to 13.0.3
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@13.0.3...13.0.3)

Updates `dotnetrdf` from 3.3.0 to 3.3.1
- [Release notes](https://github.com/dotnetrdf/dotnetrdf/releases)
- [Changelog](https://github.com/dotnetrdf/dotnetrdf/blob/main/ChangeLog.txt)
- [Commits](dotnetrdf/dotnetrdf@v3.3.0...v3.3.1)

---
updated-dependencies:
- dependency-name: newtonsoft.json
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: dotnetrdf
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

dotnet/CASE2GeoJSON.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="dotnetrdf" Version="3.3.0" />
+    <PackageReference Include="dotnetrdf" Version="3.3.1" />
     <PackageReference Include="newtonsoft.json" Version="13.0.3" />
   </ItemGroup>