Bump FluentAssertions from 6.12.2 to 8.9.0#21

dependabot[bot] wants to merge 1 commit intomaincamunda/orchestration-cluster-api-csharp:mainfrom

dependabot/nuget/test/Camunda.Orchestration.Sdk.IntegrationTests/main/multi-68e4d70ea2camunda/orchestration-cluster-api-csharp:dependabot/nuget/test/Camunda.Orchestration.Sdk.IntegrationTests/main/multi-68e4d70ea2Copy head branch name to clipboard