chore(deps): update dependency fluentassertions to 8.1.1

Author: renovate[bot]

src/Directory.Packages.props

@@ -65,7 +65,7 @@
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.2" />
     <PackageVersion Include="Verify.Xunit" Version="28.12.0" />
     <PackageVersion Include="Xunit.StaFact" Version="1.2.69" />
-    <PackageVersion Include="FluentAssertions" Version="8.0.1" />
+    <PackageVersion Include="FluentAssertions" Version="8.1.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     <PackageVersion Include="Microsoft.Reactive.Testing" Version="6.0.1" />
     <PackageVersion Include="PublicApiGenerator" Version="11.4.2" />