chore(deps): Bump FluentAssertions from 8.5.0 to 8.6.0

---
updated-dependencies:
- dependency-name: FluentAssertions
  dependency-version: 8.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

tests/Auth0.AspNetCore.Authentication.IntegrationTests/Auth0.AspNetCore.Authentication.IntegrationTests.csproj

@@ -24,7 +24,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="FluentAssertions" Version="8.5.0" />
+    <PackageReference Include="FluentAssertions" Version="8.6.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.*" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.ViewFeatures" Version="2.3.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />