Update dependency FluentAssertions to v8

Author: renovate[bot]

tests/Dfsseta.ApplyForLanding.UnitTests/Dfsseta.ApplyForLanding.UnitTests.csproj

@@ -11,7 +11,7 @@
 
     <ItemGroup>
         <PackageReference Include="FakeItEasy" Version="8.3.0" />
-        <PackageReference Include="FluentAssertions" Version="7.0.0" />
+        <PackageReference Include="FluentAssertions" Version="8.5.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0"/>
         <PackageReference Include="xunit" Version="2.9.2"/>
         <PackageReference Include="xunit.runner.visualstudio" Version="3.0.0">