Log Message:
xournalpp: update to 1.2.6.

## 1.2.6

* Fixed a weird behaviour when drawing the outline of the compass multiple times \ 
(#6265, #6256)
* Exposed selected text to the windowing system for accessibility purposes \ 
(#6221, #6215)
* MacOS: Fixed loading of jpeg images from the PDF background (#6184, #6167)
* MacOS: Fixed CJK and Cyrillic font rendering (#6285, #3474)