Cauldrons do not use minecraft:block.iron.* sounds despite being made of iron

The bug

Cauldrons are a block composed entirely of iron. However, despite this, they use generic "metal" sounds for placement, breaking, footsteps and falling, despite the existence of dedicated "iron" sounds as of 25w02a.

This does not duplicate MC-239074, as that concerned the generic "metal" sound rather than the dedicated "iron" sound.

How to reproduce

1. Place/break/walk on iron blocks
2. Place/break/walk on cauldrons

Expected results

The exact same set of sounds would be used.

Actual results

Cauldrons use the old, incorrect sounds.

How to fix

Make cauldrons use the new sounds.