Update mysql version in test docker-compose

[hramezani]

Django main requires mysql > 8.4

django.db.utils.NotSupportedError: MySQL 8.4 or later is required (found 8.0.44).

https://github.com/jazzband/django-auditlog/actions/runs/18850068183/job/53784166318?pr=776

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.85%. Comparing base (8c9b7b4) to head (ac65171).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #777   +/-   ##
=======================================
  Coverage   95.85%   95.85%           
=======================================
  Files          35       35           
  Lines        1207     1207           
=======================================
  Hits         1157     1157           
  Misses         50       50           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[2ykwang]

thanks @hramezani for the PR.