Update Django and django-oscar to Latest Compatible Versions

[qasimgulzar]

Currently, the project is using outdated versions of Django (>=3.2,<4.0) and django-oscar (3.2.4). To ensure continued security, compatibility, and access to new features, we should update to the latest supported versions of both packages.

Tasks

• Update Django to the latest LTS version (preferably Django 5.x if compatible).
• Update django-oscar to the latest version that supports the chosen Django version.
• Update the requirements file accordingly.
• Test the application for compatibility issues and resolve any deprecations or breaking changes.
• Update documentation if necessary.

Acceptance Criteria:
The project runs successfully with the updated versions.
All tests pass.
No deprecated or removed APIs are used.

References:
Django Release Notes
django-oscar Release Notes

[qasimgulzar]

#40