[DOP-13851] Update MySQL package to 8.4.0

[dolfinus]

Change Summary

MySQL package recently updated from 8.3.0 to 8.4.0. Use the latest version.

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.77%. Comparing base (22818a5) to head (300f5ad).
Report is 68 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #285   +/-   ##
========================================
  Coverage    94.77%   94.77%           
========================================
  Files          210      210           
  Lines         8187     8187           
  Branches      1410     1410           
========================================
  Hits          7759     7759           
  Misses         305      305           
  Partials       123      123           

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