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
New icons from Andrzej Ambroż / jendrzych:
- New icons for select tool modes
- Brought back screen icon for viewport visibility toggles
- Added new Instanced visibility toggle (unused currently - meant for forthcoming updates to the Outliner)
- New Gizmo icon for the header
- Many tweaks and alterations to existing icons. Full list on Devtalk
- Use correct icon when Proportional Editing is disabled