Bump Microsoft.Extensions.FileProviders.Abstractions

Bumps [Microsoft.Extensions.FileProviders.Abstractions](https://github.com/dotnet/runtime) from 6.0.0 to 9.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v6.0.0...v9.0.0)

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

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

nuget/helpers/lib/NuGetUpdater/NuGetProjects/Directory.Packages.props

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <MicrosoftBuildVersion>17.12.6</MicrosoftBuildVersion>
-    <MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>6.0.0</MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>
+    <MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>9.0.0</MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>
     <MicrosoftExtensionsFileSystemGlobbingPackageVersion>9.0.0</MicrosoftExtensionsFileSystemGlobbingPackageVersion>
     <MicrosoftWebXdtPackageVersion>3.0.0</MicrosoftWebXdtPackageVersion>
     <SystemPackagesVersion>4.3.0</SystemPackagesVersion>