Package Dependencies: Bump FluentAssertions to 8.4.0

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-version: 8.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: FluentAssertions
  dependency-version: 8.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

QueryKit.IntegrationTests/QueryKit.IntegrationTests.csproj

@@ -12,7 +12,7 @@
         <PackageReference Include="AutoBogusLifesupport" Version="2.14.0" />
         <PackageReference Include="Bogus" Version="35.6.1" />
         <PackageReference Include="Ductus.FluentDocker" Version="2.10.59" />
-        <PackageReference Include="FluentAssertions" Version="7.0.0" />
+        <PackageReference Include="FluentAssertions" Version="8.4.0" />
         <PackageReference Include="MediatR" Version="12.4.1" />
         <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.0" />
         <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="9.0.0" />