upgrade django v5.2.14 to remediate snyk vulnerabilites

[pkfec]

Summary (required)

• Resolves #7044

This PR upgrades django to remediate a security vulnerability.

Required reviewers 1-2 devs

How to test

• checkout this branch
• create a new virtualenv
• pip install -r requirements.txt
• pip install -r requirements-dev.txt
• run snyk test --all-projects
• pytest
• cd fec/
• ./manage.py runserver
• Test the sites general functionality and Wagtail admin

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.02%. Comparing base (aece827) to head (c9a83cf).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #7099   +/-   ##
========================================
  Coverage    79.02%   79.02%           
========================================
  Files          255      255           
  Lines         6679     6679           
========================================
  Hits          5278     5278           
  Misses        1401     1401           

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