Bump Microsoft.Extensions.Configuration.Abstractions

Bumps [Microsoft.Extensions.Configuration.Abstractions](https://github.com/dotnet/runtime) from 8.0.0-rc.2.23479.6 to 8.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.0-rc.2.23479.6...v8.0.0)

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

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

src/Directory.Packages.props

@@ -26,7 +26,7 @@
 		<PackageVersion Include="ReverseMarkdown" Version="3.25.0" />
 		<PackageVersion Include="System.Text.Json" Version="8.0.0-rc.2.23479.6" />
 		<PackageVersion Include="Microsoft.Extensions.Logging" Version="8.0.0-rc.2.23479.6" />
-		<PackageVersion Include="Microsoft.Extensions.Configuration.Abstractions" Version="8.0.0-rc.2.23479.6" />
+		<PackageVersion Include="Microsoft.Extensions.Configuration.Abstractions" Version="8.0.0" />
 		<PackageVersion Include="WilderMinds.MetaWeblog" Version="5.1.1" />
 		<PackageVersion Include="X.PagedList.Mvc.Core" Version="8.4.7" />
 		<!-- Required to avoid warnings in 1.9.0.1 of Android.Material - https://github.com/xamarin/AndroidX/issues/727 -->