Upgrade from Django 3.2 to 4.2

[ihalaij1]

Description

What?

Remove features deprecated and removed in Django version 4.0, 4.1, and 4.2.

Why?

Django 4.2 (LTS) was released in April 2023. Django v3.2 reaches end of life in April 2024.

How?

I went through the release notes for Django 4.0, 4.1 and 4.2 and checked which deprecated and removed features appear in the codebase and removed/edited them.

Testing

What type of test did you run?

• [ ] Accessibility test using the WAVE extension.
• [ ] Django unit tests.
• [ ] Selenium tests.
• [ ] Other test. (Add a description below)
• [x] Manual testing.

Manually tested some features affected by changes in code.

Did you test the changes in

• [x] Chrome
• [ ] Firefox
• [ ] This pull request cannot be tested in the browser.

Translation

• [ ] Did you modify or add new strings in the user interface? (Read about how to create translation)

Programming style

• [x] Did you follow our style guides?
• [ ] Did you use Python type hinting in all functions that you added or edited? (type hints for function parameters and return values)

Have you updated the README or other relevant documentation?

• [ ] documents inside the doc directory.
• [x] README.md.
• [ ] Aplus Manual.
• [ ] Other documentation (mention below which documentation).

Is it Done?

• [ ] Reviewer has finished the code review
• [ ] After the review, the developer has made changes accordingly
• [ ] Customer/Teacher has accepted the implementation of the feature