Form-designer

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* Avoided crashing when trying to prettify the data.
* Limited the email field choices to email fields only when using the send
emails to authors option.
* Stopped slugifying choice values so that we properly support non-latin
characters.
* Added Python 3.13.
* Added support for ``django-simple-captcha``.

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* Changed form submissions to convert choice values back to the unslugified
variant.
* Changed ``FormSubmission.formatted_data`` to automatically comma-separate
list values instead of returning the list representation.

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* Fixed an incorrect input type of the ``author_email_field`` field.
* Added Django 5.1, dropped Django 4.1.

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* Raised the minimum django-recaptcha version to 4.0.

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* Added Django 5.0, Python 3.12.
* Forwarded ``**kwargs`` to the ``process`` handlers.

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* Changed the default ordering of forms in the admin change list to
alphabetical.
* Modernized the package, switched to ruff and hatchling.
* Dropped Python 3.8 support.
* Added Django 4.2 to the CI.