chore(deps): update dependency fluentassertions to v8

Author: renovate[bot]

Directory.Packages.props

@@ -39,7 +39,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.1" />
     <PackageVersion Include="xunit" Version="2.9.3" />
-    <PackageVersion Include="FluentAssertions" Version="7.1.0" />
+    <PackageVersion Include="FluentAssertions" Version="8.0.0" />
     <PackageVersion Include="Verify.Xunit" Version="28.0.0" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.4.3" />
     <PackageVersion Include="NSubstitute" Version="5.3.0" />