Add Django 5.2

[adamchainz]

Currently in beta: https://www.djangoproject.com/weblog/2025/feb/19/django-52-beta-1-released/

The versioned documentation has been available since the alpha release: https://docs.djangoproject.com/en/5.1/

• Updated the versions and releases in the scraper file
• Ensured the license is up-to-date
• Ensured the icons and the SOURCE file in public/icons/your_scraper_name/ are up-to-date if the documentation has a custom icon
• Ensured self.links contains up-to-date urls if self.links is defined
• [[ ]] Tested the changes locally to ensure:
  • The scraper still works without errors
  • The scraped documentation still looks consistent with the rest of DevDocs
  • The categorization of entries is still good

(Adapted from my previous Django 5.1 PR: #2300.)

[simon04]

Thank you!