Update actions workflows, and support for python, django and drf

[nezhar]

This pull request includes updates to the CI workflows and documentation to support newer versions of Python, Django, and Django Rest Framework (DRF). Additionally, it updates the Codecov action version.

CI Workflow Updates:

• .github/workflows/test-postgres.yml: Added support for Python 3.13, Django 5.1, and DRF 3.15. Removed support for Python 3.8 and Django 3.2. Updated exclusion matrix accordingly.
• .github/workflows/test.yml: Added support for Python 3.13, Django 5.1, and DRF 3.15. Removed support for Python 3.8 and Django 3.2. Updated exclusion matrix accordingly.
• .github/workflows/test.yml: Updated Codecov action from version 1 to version 4.

Documentation Update:

• README.md: Updated compatibility table to include new versions for django-rest-passwordreset 1.5, supporting Django 4.2, 5.0, 5.1, and DRF 3.15.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.78%. Comparing base (79118b6) to head (106bc39).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #196   +/-   ##
=======================================
  Coverage   90.78%   90.78%           
=======================================
  Files          12       12           
  Lines         282      282           
=======================================
  Hits          256      256           
  Misses         26       26           

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