Remove old comment about excluding executor_config (apache#48830)

This comment isn't true as of apache#48826

Author: kaxil

providers/cncf/kubernetes/src/airflow/providers/cncf/kubernetes/executors/kubernetes_executor_utils.py

@@ -395,8 +395,6 @@ def run_next(self, next_job: KubernetesJobType) -> None:
 
             if isinstance(command[0], ExecuteTask):
                 workload = command[0]
-                # `executor_config` is a k8s.V1Pod object and we do not need to pass it to the
-                # execute_workload module. So, we exclude it from the serialisation process.
                 ser_input = workload.model_dump_json()
                 command = [
                     "python",