Mostly just the result of running `blender_icons_update.py` without adding or changing any icon source files. Removal of three unused icons and adding three others to the project to resolve conflicts between them.
Pull Request: https://projects.blender.org/blender/blender/pulls/114874
Each constraint now has a unique icon, just like modifiers.
Icons are designed by Andrzej Ambroż & Alessio Monti, with user input.
Patch by Alessio Monti.