Bump FluentAssertions from 6.7.0 to 6.8.0

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 6.7.0 to 6.8.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.7.0...6.8.0)

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

test/UnitTests/UnitTests.csproj

@@ -18,7 +18,7 @@
 
   <ItemGroup>
     <PackageReference Include="AutoFixture" Version="4.17.0" />
-    <PackageReference Include="FluentAssertions" Version="6.7.0" />
+    <PackageReference Include="FluentAssertions" Version="6.8.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
     <PackageReference Include="SpecFlow.Tools.MsBuild.Generation" Version="3.9.74" />
     <PackageReference Include="SpecFlow.xUnit" Version="3.9.74" />