• Revert pre-fork hooks for multi-concurrent (Lambda Managed Instances) mode introduced in 4.1.0 (#226), as the change was breaking. The awslambdaric.lambda_concurrency_hooks module, the @register_pre_fork decorator and the Runtime.PreForkError error type are removed, restoring the 4.0.4 multi-concurrent startup behavior. No impact on the standard on-demand path.