Bump FluentAssertions from 5.10.3 to 8.0.0

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 5.10.3 to 8.0.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@5.10.3...8.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

OpenAPI/LearningHub.Nhs.OpenApi.Tests/LearningHub.Nhs.OpenApi.Tests.csproj

@@ -9,7 +9,7 @@
 	</PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="FluentAssertions" Version="5.10.3" />
+        <PackageReference Include="FluentAssertions" Version="8.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
         <PackageReference Include="Moq" Version="4.20.72" />
         <PackageReference Include="NBuilder" Version="6.1.0" />