chore(deps): update dependency fluentassertions to 8.8.0

Author: renovate[bot]

src/Directory.Packages.props

@@ -36,7 +36,7 @@
     <PackageVersion Include="xunit.runner.console" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageVersion Include="Xunit.StaFact" Version="3.0.13" />
-    <PackageVersion Include="FluentAssertions" Version="8.7.1" />
+    <PackageVersion Include="FluentAssertions" Version="8.8.0" />
     <PackageVersion Include="Microsoft.Reactive.Testing" Version="6.1.0" />
     <PackageVersion Include="PublicApiGenerator" Version="11.5.0" />
     <PackageVersion Include="coverlet.msbuild" Version="6.0.4" />