XCom dictionary key order not preserved

### Apache Airflow version 3.1.0 ### If "Other Airflow 2/3 version" selected, which one? _No response_ ### What happened? When passing a dictionary through XCom (at least as a return-value), key order is not preserved. The keys appear to be sorted alphabetically when inspected from a consuming task. ### What you think should happen instead? Since Python 3.7, dictionaries preserve the insertion order of keys. JSON dumping and loading likewise preserve this also. Since Airflow is well past that version, I would expect it to simply inherit this behavior. ### How to reproduce Minimal DAG: ```python from airflow.decorators import dag, task @dag(render_template_as_native_obj=True) def d1(): @task def create() -> dict: return { 'C': 1, 'B': 2, 'A': 3, } @task def render(d: dict): print(d) render(create()) d1() ``` The output: ``` INFO - {'A': 3, 'B': 2, 'C': 1} source=task.stdout ``` ### Operating System MacOS Tahoe 26.0.1 (25A362) ### Versions of Apache Airflow Providers I doubt any of these are relevant, but just in case: apache-airflow==3.1.0 apache-airflow-core==3.1.0 apache-airflow-providers-amazon==9.14.0 apache-airflow-providers-celery==3.12.3 apache-airflow-providers-cncf-kubernetes==10.8.1 apache-airflow-providers-common-compat==1.7.4 apache-airflow-providers-common-io==1.6.3 apache-airflow-providers-common-messaging==2.0.0 apache-airflow-providers-common-sql==1.28.1 apache-airflow-providers-docker==4.4.3 apache-airflow-providers-elasticsearch==6.3.3 apache-airflow-providers-fab==2.4.3 apache-airflow-providers-ftp==3.13.2 apache-airflow-providers-git==0.0.8 apache-airflow-providers-google==18.0.0 apache-airflow-providers-grpc==3.8.2 apache-airflow-providers-hashicorp==4.3.2 apache-airflow-providers-http==5.3.4 apache-airflow-providers-microsoft-azure==12.7.1 apache-airflow-providers-mysql==6.3.4 apache-airflow-providers-odbc==4.10.2 apache-airflow-providers-openlineage==2.7.1 apache…