Bump Microsoft.Extensions.Configuration.Json in /GraphMAUI

Bumps [Microsoft.Extensions.Configuration.Json](https://github.com/dotnet/runtime) from 7.0.0 to 8.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v7.0.0...v8.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.Configuration.Json
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

GraphMAUI/GraphMAUI.csproj

@@ -67,7 +67,7 @@
         <PackageReference Include="CommunityToolkit.Maui" Version="6.1.0" />
         <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.2" />
         <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="7.0.4" />
-        <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="7.0.0" />
+        <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
         <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="7.0.0" />
         <PackageReference Include="Microsoft.Graph" Version="5.35.0" />
         <PackageReference Include="Microsoft.Identity.Client" Version="4.57.0" />