A simple datapack mod make can updata equipment.
It add some recipes can help you updata your equipment in smithing table.( also iron and golden equipment to diamond).
Discord Link: https://discord.gg/pDaMyHDfBy
you can updata stone and leather equipment to iron equipment.
In 1.20 due to updata equipment need template，so this mod also add a recipes to help you recipes upgrade smithing template.
8 planks + 1 cobblestone
