Migrate to Godot 4.3

### Why

_**It's not out yet**,_ but it fixes some bugs with running the web builds on macOS, so I figure it would be a (very) good idea to update ASAP once it's released (which probably won't be in time for state, but still).

### The Plan

```[tasklist]
#### Tasks
- [ ] Migrate
- [ ] Commit
- [ ] PR
- [ ] Check that the preview works
- [ ] Merge
- [ ] Deploy to production
```

😉 