Bump the dotnet group across 1 directory with 3 updates (#1212)

Bumps the dotnet group with 3 updates in the /tools directory: [System.Text.Json](https://github.com/dotnet/runtime), [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) and [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest).


Updates `System.Text.Json` from 8.0.5 to 9.0.0
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.5...v9.0.0)

Updates `Newtonsoft.Json` from 13.0.3 to 13.0.1
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@13.0.3...13.0.1)

Updates `Microsoft.NET.Test.Sdk` from 17.11.1 to 17.12.0
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Changelog](https://github.com/microsoft/vstest/blob/main/docs/releases.md)
- [Commits](microsoft/vstest@v17.11.1...v17.12.0)

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: dotnet
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
...

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

tools/MarkdownConverter.Tests/MarkdownConverter.Tests.csproj

@@ -13,7 +13,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="XMLUnit.Core" Version="2.10.0" />
     <PackageReference Include="xunit" Version="2.9.2" />

tools/Utilities/Utilities.csproj

@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Octokit" Version="13.0.1" />
-    <PackageReference Include="System.Text.Json" Version="8.0.5" />
+    <PackageReference Include="System.Text.Json" Version="9.0.0" />
   </ItemGroup>
 
 </Project>