add news bullet

Author: teunbrand

NEWS.md

@@ -2,6 +2,7 @@
 
 ### Bug fixes
 
+* Added `preserve` argument to `position_jitterdodge()` (@teunbrand, #6584).
 * Fixed regression where `draw_key_rect()` stopped using `fill` colours 
   (@mitchelloharawild, #6609).
 * Fixed regression where `scale_{x,y}_*()` threw an error when an expression