Update Microsoft.Extensions.Configuration.FileExtensions requirement

Updates the requirements on [Microsoft.Extensions.Configuration.FileExtensions](https://github.com/dotnet/runtime) to permit the latest version.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.0-rc.2.23479.6...v8.0.0-rc.2.23479.6)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.Configuration.FileExtensions
  dependency-type: direct:production
...

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

src/Exceptionless.Insulation/Exceptionless.Insulation.csproj

@@ -10,7 +10,7 @@
     <PackageReference Include="Foundatio.RabbitMQ" Version="10.6.1" />
     <PackageReference Include="Foundatio.Redis" Version="10.6.1" />
     <PackageReference Include="StackExchange.Redis" Version="2.6.122" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="8.0.0-rc.2.*" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="8.0.0.pre.rc.*" />
     <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="8.0.0-rc.2.*" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0-rc.2.*" />
     <PackageReference Include="Microsoft.Extensions.DependencyModel" Version="8.0.0-rc.2.*" />