[2D][URP] Sprite Light 2D doesn't update when sprite PPU is changed

Repro steps:
- Change the PPU on the sprite that is used on either of the Sprite Lights in the example.
- Observe that the Sprite Light visuals don't update.
- If the Sprite Light is selected it is apparent that the bounds HAS changed.
- But the visuals still have not been updated.
Note: Removing the sprite reference and re-adding it works as expected.

Expected result: Sprite Light visuals should update when referenced Sprite's PPU has changed
Actual result: Sprite Light visuals does not update when referenced Sprite's PPU has changed, until its Sprite has been updated