Upgrade Django to 3.2 and update dependencies

[jrhoads]

Purpose

Upgrade the project dependencies—most notably updating Django from 2.2 to 3.2 (LTS) along with compatible package updates—and modernize configuration, routing, and CI workflow checks.

Approach

• Upgraded Django from 2.2.28 to 3.2.25 and bumped related dependencies (djangorestframework, django-prometheus, sentry-sdk, django-cors-headers) to versions compatible with Django 3.2.
• Updated URL patterns in rorapi/common/urls.py to replace deprecated url calls with re_path.
• Adjusted Django settings to conform with Django 3.2 best practices and modern third-party package conventions (DEFAULT_AUTO_FIELD, CORS_ALLOW_ALL_ORIGINS, AutoSchema compatibility, and removing duplicate middleware).
• Added system and migration checks (pip check, manage.py check, makemigrations --check --dry-run) to the GitHub Actions test workflow.
• Cleaned up obsolete Travis CI configuration files.
• Updated tests in rorapi/v2/tests.py to fix import paths and test client ID validation properly.

Key Modifications

• Dependency Upgrades (requirements.txt):
  • Django: 2.2.28 -> 3.2.25
  • djangorestframework: 3.11.2 -> 3.12.4
  • django-prometheus: 1.0.15 -> 2.2.0
  • sentry-sdk: 0.12.2 -> 1.45.1
  • django-cors-headers: 3.1.0 -> 3.13.0
• URL Routing (rorapi/common/urls.py):
  • Migrated legacy django.conf.urls.url references to django.urls.re_path.
• Project Settings (rorapi/settings.py):
  • Configured DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'.
  • Added 'DEFAULT_SCHEMA_CLASS': 'rest_framework.schemas.coreapi.AutoSchema' to maintain compatibility with coreapi schema/documentation generation.
  • Replaced deprecated CORS_ORIGIN_ALLOW_ALL with CORS_ALLOW_ALL_ORIGINS.
  • Removed duplicate django.middleware.common.CommonMiddleware entry in MIDDLEWARE.
  • Removed deprecated USE_L10N = True.
• CI / Workflows (.github/workflows/run_tests.yml, .travis.yml, .env.travis):
  • Added pip check, python -Wd manage.py check, and python manage.py makemigrations --check --dry-run to workflow steps.
  • Removed .travis.yml and .env.travis.
• Tests (rorapi/v2/tests.py):
  • Updated model import to from rorapi.v2.models import Client.
  • Replaced rate-limiting test with a test targeting /validate-client-id/<client_id>/.

Important Technical Details

• Setting REST_FRAMEWORK['DEFAULT_SCHEMA_CLASS'] to rest_framework.schemas.coreapi.AutoSchema ensures that include_docs_urls continues functioning as expected under Django REST Framework 3.12+.
• Setting DEFAULT_AUTO_FIELD prevents Django 3.2 from generating unwanted implicit auto field migrations across models.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Reviewer, please remember our guidelines:

• Be humble in the language and feedback you give, ask don't tell.
• Consider using positive language as opposed to neutral when offering feedback. This is to avoid the negative bias that can occur with neutral language appearing negative.
• Offer suggestions on how to improve code e.g. simplification or expanding clarity.
• Ensure you give reasons for the changes you are proposing.