prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Migration 0040_set_admin_is_staff.py is missing dependency on user model
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `pulpcore/app/migrations/0040_set_admin_is_staff.py`
  Content:
  ```
  1 # Generated by Django 2.2.13 on 2020-07-01 21:29
  2 
  3 from django.contrib.auth import get_user_model
  4 from django.db import migrations
  5 
  6 
  7 def allow_admin_as_staff(apps, schema_editor):
  8     user_model = get_user_model()
  9     try:
  10         admin_user = user_model.objects.get(username='admin')
  11     except user_model.DoesNotExist:
  12         pass
  13     else:
  14         admin_user.is_staff = True
  15         admin_user.save()
  16 
  17 
  18 class Migration(migrations.Migration):
  19 
  20     dependencies = [
  21         ('core', '0039_change_download_concurrency'),
  22     ]
  23 
  24     operations = [
  25         migrations.RunPython(allow_admin_as_staff),
  26     ]
  27
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/pulpcore/app/migrations/0040_set_admin_is_staff.py b/pulpcore/app/migrations/0040_set_admin_is_staff.py
  --- a/pulpcore/app/migrations/0040_set_admin_is_staff.py
  +++ b/pulpcore/app/migrations/0040_set_admin_is_staff.py
  @@ -1,5 +1,6 @@
   # Generated by Django 2.2.13 on 2020-07-01 21:29
   
  +from django.conf import settings
   from django.contrib.auth import get_user_model
   from django.db import migrations
   
  @@ -19,8 +20,9 @@
   
       dependencies = [
           ('core', '0039_change_download_concurrency'),
  +        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
       ]
   
       operations = [
  -        migrations.RunPython(allow_admin_as_staff),
  +        migrations.RunPython(allow_admin_as_staff, reverse_code=migrations.RunPython.noop, elidable=True),
       ]
  
verification_info: {"golden_diff": "diff --git a/pulpcore/app/migrations/0040_set_admin_is_staff.py b/pulpcore/app/migrations/0040_set_admin_is_staff.py\n--- a/pulpcore/app/migrations/0040_set_admin_is_staff.py\n+++ b/pulpcore/app/migrations/0040_set_admin_is_staff.py\n@@ -1,5 +1,6 @@\n # Generated by Django 2.2.13 on 2020-07-01 21:29\n \n+from django.conf import settings\n from django.contrib.auth import get_user_model\n from django.db import migrations\n \n@@ -19,8 +20,9 @@\n \n     dependencies = [\n         ('core', '0039_change_download_concurrency'),\n+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),\n     ]\n \n     operations = [\n-        migrations.RunPython(allow_admin_as_staff),\n+        migrations.RunPython(allow_admin_as_staff, reverse_code=migrations.RunPython.noop, elidable=True),\n     ]\n", "issue": "Migration 0040_set_admin_is_staff.py is missing dependency on user model\n\n", "before_files": [{"content": "# Generated by Django 2.2.13 on 2020-07-01 21:29\n\nfrom django.contrib.auth import get_user_model\nfrom django.db import migrations\n\n\ndef allow_admin_as_staff(apps, schema_editor):\n    user_model = get_user_model()\n    try:\n        admin_user = user_model.objects.get(username='admin')\n    except user_model.DoesNotExist:\n        pass\n    else:\n        admin_user.is_staff = True\n        admin_user.save()\n\n\nclass Migration(migrations.Migration):\n\n    dependencies = [\n        ('core', '0039_change_download_concurrency'),\n    ]\n\n    operations = [\n        migrations.RunPython(allow_admin_as_staff),\n    ]\n", "path": "pulpcore/app/migrations/0040_set_admin_is_staff.py"}], "after_files": [{"content": "# Generated by Django 2.2.13 on 2020-07-01 21:29\n\nfrom django.conf import settings\nfrom django.contrib.auth import get_user_model\nfrom django.db import migrations\n\n\ndef allow_admin_as_staff(apps, schema_editor):\n    user_model = get_user_model()\n    try:\n        admin_user = user_model.objects.get(username='admin')\n    except user_model.DoesNotExist:\n        pass\n    else:\n        admin_user.is_staff = True\n        admin_user.save()\n\n\nclass Migration(migrations.Migration):\n\n    dependencies = [\n        ('core', '0039_change_download_concurrency'),\n        migrations.swappable_dependency(settings.AUTH_USER_MODEL),\n    ]\n\n    operations = [\n        migrations.RunPython(allow_admin_as_staff, reverse_code=migrations.RunPython.noop, elidable=True),\n    ]\n", "path": "pulpcore/app/migrations/0040_set_admin_is_staff.py"}]}