Update Django from 5.0 to 5.1

[pulse-mind]

Description

Migrate Django 5.0 -> Django 5.1

Checklist:

• I've made sure that tests are updated accordingly (especially if adding or updating a template option)
• I've updated the documentation or confirm that my change doesn't require any updates

Rationale

Fix #5288

[foarsitter]

@pulse-mind ignore the align versions tests, that is beyond your scope I guess.

If you scroll down to the bottom of https://github.com/cookiecutter/cookiecutter-django/actions/runs/14038022599/job/39300820748?pr=5740 I see the following error:

django.db.utils.NotSupportedError: PostgreSQL 13 or later is required (found 12.22)

[pulse-mind]

I've seen, I was surprised because I did not change that, but it is true Django 5.1 drop PostgreSQL 12.

[pulse-mind]

Now I do not understand the errors.

[foarsitter]

mypy is failing:

my_awesome_project/users/tests/factories.py:30: error: "UserFactory" has no attribute "set_password"; maybe "password"?  [attr-defined]
my_awesome_project/users/tests/factories.py:35: error: "FactoryOptions" has no attribute "skip_postgeneration_save"  [attr-defined]
my_awesome_project/conftest.py:14: error: Incompatible return value type (got "UserFactory", expected "User")  [return-value]
my_awesome_project/users/forms.py:14: error: Name "admin_forms.AdminUserCreationForm" is not defined  [name-defined]
my_awesome_project/users/tests/test_views.py:88: error: Incompatible types in assignment (expression has type "UserFactory", variable has type "User | AnonymousUser")

Not sure if it's by design, but we don't run mypy against bare metal. As a result, the errors only show up during the Docker stages.

[pulse-mind]

I solved all issues. Thank you for your help.

[browniebroke]

Thank you 🎉