This update for openhantek fixes the following issues:

Update to 3.3.3:

* fix #376 "vector's iterator dereference out of range"
* due to low issue activity remove the automatic stale workflow
* fix #374 start / stop roll mode sampling (almost) immediately
* split 'samplerateChanged' event handler; remove useless
  'this->'
* update translations
* Fixes #363, refs #365. Splitted
  HorizontalDock::timebaseChanged event handler from doing
  operations on dsoControl and dsoWidget in the same callback.
  Now there two callback and each uses the Widget it operates
  on. [875a8dc]
* Add support for YiXingDianZiKeJi YX-DSO (MSDO)
* show error message when screenshot or export file write fails
* MSDO calibration file update from real device.
* Add support for YiXingDianZiKeJi YX-DSO (MSDO)
* change dB suffix with "Ok" or "Apply"
* i18n for dB suffix "V", "u", "m"; silence more warnings
* move "Demo Mode" button to dialog button box at the window
  bottom