Apply scale-attribute to backpack entity if player has it

[Boy0000]

Plugin Version

No response

Server Version

No response

Issue description

No response

Steps to reproduce

1. Equip backpack
2. /attribute playername minecraft:generic.scale base set 0.2
3. Backpack remains normal size

Issue priority

Low (slightly annoying)

Other Versions

No response

[LoJoSho]

This is partially related to the decision to stick to the lowest API of the version we support to ensure compatibility with that version. We'll either have to reverse that decision or drop versions so the lowest we support would be 1.20.6.