* [:backend:`5924`] Fixed validation messages being linked to the wrong (non-applicable)
steps, causing confusing error mesages in the public frontend.
* [:backend:`6171`] Fixed missing required XML-attributes in StUF-ZDS messages.
* [:backend:`6148`] Fixed crash in JSON schema generation when there's a fieldset inside
an editgrid.
* [:backend:`6139`] Fixed wrong entity type in StUF-ZDS element for the cosigner details.
* [:backend:`6181`] Fixed simple conditionals ("frontend logic") comparison not
interpreting "empty" file upload fields correctly. This patch is a workaround for a
more complex structural fix.
* [:backend:`6128`] Fix dynamic radio/selectboxes/select options with empty labels being
rendered. This patch is a workaround for a more complex structural fix.
* Fixed missing structlog context propagation across threads, causing prefill (audit)
logs not to be saved in the database.
* [:backend:`6222`] Upgraded to SDK 3.4.3, which includes a number of fixes in the new
renderer - see the SDK release notes for details.
* Applied latest available security patches of the libraries that we use.