Bump Microsoft.Extensions.Configuration from 8.0.0 to 9.0.0

Bumps [Microsoft.Extensions.Configuration](https://github.com/dotnet/runtime) from 8.0.0 to 9.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.0...v9.0.0)

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

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

Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="Avalonia.Fonts.Inter" Version="11.1.4" />
     <PackageVersion Include="Avalonia.Diagnostics" Version="11.1.4" />
     <PackageVersion Include="Avalonia.ReactiveUI" Version="11.1.4" />
-    <PackageVersion Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration" Version="9.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Configuration.Json" Version="8.0.1" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="8.0.1" />
     <PackageVersion Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="8.0.0" />