chore(deps): update dependency fluentassertions to v8

Author: renovate[bot]

src/HttpGenerator.Tests/HttpGenerator.Tests.csproj

@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="Atc.Test" Version="1.1.18" />
-    <PackageReference Include="FluentAssertions" Version="7.2.0" />
+    <PackageReference Include="FluentAssertions" Version="8.7.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">