reset-admin-password triggers `'UserManager' object has no attribute 'make_random_password'`

[ianballou]

Version
All versions with Django 5 (tested on 3.105)

Describe the bug
reset-admin-password.py contains a call to User.objects.make_random_password, but the method was removed in Django 5.1 (https://django.readthedocs.io/en/stable/releases/5.1.html#features-removed-in-5-1)

To Reproduce
Run the reset-admin-password management command

  File "/usr/local/bin/pulpcore-manager", line 8, in <module>                                                                                                     
    sys.exit(manage())                                                                                                                                            
             ^^^^^^^^                                                                                                                                             
  File "/usr/local/lib/python3.11/site-packages/pulpcore/app/manage.py", line 11, in manage                                                                       
    execute_from_command_line(sys.argv)                                                                                                                           
  File "/usr/local/lib/python3.11/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line                                       
    utility.execute()                                                                                                                                             
  File "/usr/local/lib/python3.11/site-packages/django/core/management/__init__.py", line 436, in execute                                                         
    self.fetch_command(subcommand).run_from_argv(self.argv)                                                                                                       
  File "/usr/local/lib/python3.11/site-packages/django/core/management/base.py", line 420, in run_from_argv                                                       
    self.execute(*args, **cmd_options)                                                                                                                            
  File "/usr/local/lib/python3.11/site-packages/django/core/management/base.py", line 464, in execute                                                             
    output = self.handle(*args, **options)                                                                                                                        
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                                                        
  File "/usr/local/lib/python3.11/site-packages/pulpcore/app/management/commands/reset-admin-password.py", line 37, in handle                                     
    password = User.objects.make_random_password(length=20)                                                                                                       
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                                                  
AttributeError: 'UserManager' object has no attribute 'make_random_password' 

Expected behavior
The password is reset without error

Additional context
Add any other context about the problem here. Please provide links to any previous discussions via Discourse or Bugzilla.

[gerrod3]

Note this is when using the --random option. Django recommends using Python best practices for generating the secret: https://docs.python.org/3/library/secrets.html#recipes-and-best-practices