Log Message:
py-wtforms: updated to 3.2.1

Version 3.2.1

- Fix :class:`~fields.SelectMultipleBase` import. :issue:`861` :pr:`862`

Version 3.2.0

- Translations update: korean, chinese (traditional), portugese, russian,
  dutch, kazakh, swedish, turkish, slovak, ukranian, spanish, french.
- Move the repository to the pallets-eco organization. :pr:`854`
- Stop supporting Python 3.9 and start supporting Python 3.13 :pr:`855`
- Removed `required` flag support from :class:`~fields.HiddenWidget`,
  :class:`~fields.RangeWidget` and :class:`~fields.SelectWidget` to
  conform to W3C :pr:`810`
- :class:`~wtforms.validators.NoneOf` and :class:`~wtforms.validators.AnyOf`
  can validate multiple valued fields like :class:`~fields.SelectMultipleField`
  :pr:`538` :pr:`807`
- Use GHA and pre-commit workflows inspired from Flask. :pr:`856` :pr:`860`
- ⚠️Breaking change⚠️: Some deprecated code was removed (:pr:`859`):

  - :class:`~wtforms.Flags` can no longer be tuples. :issue:`467`
  - `iter_choices` needs a tuple of 4 items :issue:`816`

- ⚠️Breaking change⚠️: The key for form errors moved from :data:`None` to
  empty string `""`. :issue:`829` :pr:`858`

.. note::
   If you need to keep the old behavior you can set the ``_form_error_key``
   parameter of your form to :data:`None`.