- 21.0.68 SpawnPlacementRegisterEvent -> RegisterSpawnPlacementsEvent

### Issue description

neoforge changed

### Steps to reproduce

_No response_

### Minecraft version

1.21 (Latest)

### NeoForge version

neoforge-21.0.76-beta

### Mekanism version

10.6.4 (Latest)

### Other relevant versions

_No response_

### If a (crash)log is relevant for this issue, link it here: (It's almost always relevant)

_No response_