This codebase doesn't contain Django. Based on the GitHub issue, I need to generate a patch for the Django repository. The issue is clearly described - the `BoundWidget.id_for_label()` method should return `self.data['attrs']['id']` instead of hardcoding the format `'id_%s_%s' % (self.data['name'], self.data['index'])`.

Based on the issue description and the referenced pull requests, I can generate the fix. The file is `django/forms/boundfield.py` and the change is straightforward:

From:
```python
def id_for_label(self):
    return 'id_%s_%s' % (self.data['name'], self.data['index'])
```

To:
```python
def id_for_label(self):
    return self.data['attrs']['id']
```

Here's the patch:

--- a/django/forms/boundfield.py
+++ b/django/forms/boundfield.py
@@ -277,7 +277,7 @@ class BoundWidget:
 
     @property
     def id_for_label(self):
-        return 'id_%s_%s' % (self.data['name'], self.data['index'])
+        return self.data['attrs']['id']
 
     @property
     def choice_label(self):