* [#4151] Fixed backend validation error being triggered for radio/select/selectboxes
  components that get their values/options from another variable.
* [#4052] Fixed payment (reminder) emails being sent more often than intended.
* [#4124] Fixed forms being shown multiple times in the admin list overview.
* [#4156] Fixed the format of order references sent to payment providers. You can now
  provide your own template.
* Fixed some bugs in the form builder:

    - Added missing error message codes (for translations) for the selectboxes component.
    - Fixed the "client-side logic" to take the correct data type into account.
    - Fixed the validation tab not being marked as invalid in some validation error
      situations.

* Upgraded some dependencies with their latest (security) patches.
* [#4172] Fixed a crash while running input validation on date fields when min/max date
  validations are specified.
* [#4141] Fixed a crash in the Objects API registration when using periods in component
  keys.