Update Microsoft.AspNetCore.Mvc.NewtonsoftJson requirement

Updates the requirements on [Microsoft.AspNetCore.Mvc.NewtonsoftJson](https://github.com/dotnet/aspnetcore) to permit the latest version.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v8.0.0-rc.2.23480.2...v8.0.0-rc.2.23480.2)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.Mvc.NewtonsoftJson
  dependency-type: direct:production
...

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

src/Exceptionless.Web/Exceptionless.Web.csproj

@@ -19,7 +19,7 @@
     <PackageReference Include="Exceptionless.AspNetCore" Version="6.0.3" />
     <PackageReference Include="Joonasw.AspNetCore.SecurityHeaders" Version="5.0.0" />
     <PackageReference Include="Microsoft.AspNetCore.SpaProxy" Version="8.0.0-rc.2.*" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="8.0.0-rc.2.*" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="8.0.0.pre.rc.*" />
     <PackageReference Include="Microsoft.Extensions.Diagnostics.HealthChecks" Version="8.0.0-rc.2.*" />
     <PackageReference Include="MiniValidation" Version="0.9.0" />
     <PackageReference Include="NEST.JsonNetSerializer" Version="7.17.5" />