CI job trips on Apache Superset 2.x: `AttributeError: module 'flask.json' has no attribute 'JSONEncoder'` about cratedb-examples HOT 5 CLOSED

Traceback (most recent call last):
  File "/path/to/bin/superset", line 5, in <module>
    from superset.cli.main import superset
  File "/path/to/lib/python3.11/site-packages/superset/__init__.py", line 21, in <module>
    from superset.app import create_app
  File "/path/to/lib/python3.11/site-packages/superset/app.py", line 23, in <module>
    from superset.initialization import SupersetAppInitializer
  File "/path/to/lib/python3.11/site-packages/superset/initialization/__init__.py", line 27, in <module>
    from flask_appbuilder import expose, IndexView
  File "/path/to/lib/python3.11/site-packages/flask_appbuilder/__init__.py", line 5, in <module>
    from .api import ModelRestApi  # noqa: F401
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/path/to/lib/python3.11/site-packages/flask_appbuilder/api/__init__.py", line 38, in <module>
    from ..baseviews import AbstractViewApi
  File "/path/to/lib/python3.11/site-packages/flask_appbuilder/baseviews.py", line 22, in <module>
    from .forms import GeneralModelConverter
  File "/path/to/lib/python3.11/site-packages/flask_appbuilder/forms.py", line 3, in <module>
    from flask_wtf import FlaskForm
  File "/path/to/lib/python3.11/site-packages/flask_wtf/__init__.py", line 4, in <module>
    from .recaptcha import Recaptcha
  File "/path/to/lib/python3.11/site-packages/flask_wtf/recaptcha/__init__.py", line 1, in <module>
    from .fields import RecaptchaField
  File "/path/to/lib/python3.11/site-packages/flask_wtf/recaptcha/fields.py", line 3, in <module>
    from . import widgets
  File "/path/to/lib/python3.11/site-packages/flask_wtf/recaptcha/widgets.py", line 6, in <module>
    JSONEncoder = json.JSONEncoder
                  ^^^^^^^^^^^^^^^^
AttributeError: module 'flask.json' has no attribute 'JSONEncoder'