Bump FluentAssertions from 8.8.0 to 8.9.0 (#161)

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-version: 8.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: gstraccini[bot] <150967461+gstraccini[bot]@users.noreply.github.com>

Author: dependabot[bot]

Tests/AIDocument.Tests/AIDocument.Tests.csproj

@@ -11,7 +11,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="FluentAssertions" Version="8.8.0" />
+    <PackageReference Include="FluentAssertions" Version="8.9.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
     <PackageReference Include="xunit" Version="2.9.3" />