update Django documentation URLs to 4.2

[TimidRobot]

Description

• update Django documentation URLs to 4.2
  • (should have been included in upgrade to Python 3.11 and Django 4.2 #435)

Tests

• no functional changes
• each of the new links resolves as expected

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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Developer Certificate of Origin

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