chore(deps): update dependency fluentassertions to v8

Author: renovate[bot]

src/Directory.Packages.props

@@ -66,7 +66,7 @@
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.1" />
     <PackageVersion Include="Verify.Xunit" Version="28.9.0" />
     <PackageVersion Include="Xunit.StaFact" Version="1.2.69" />
-    <PackageVersion Include="FluentAssertions" Version="7.1.0" />
+    <PackageVersion Include="FluentAssertions" Version="8.0.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="Microsoft.Reactive.Testing" Version="6.0.1" />
     <PackageVersion Include="PublicApiGenerator" Version="11.3.0" />