style: use @PHP84Migration ruleset

[DjordyKoert]

Description

use @PHP84Migration ruleset

What type of PR is this? (check all applicable)

• Bug Fix
• Feature
• Refactor
• Deprecation
• Breaking Change
• Documentation Update
• CI

Checklist

• I have made corresponding changes to the documentation (docs/)
• I have made corresponding changes to the changelog (CHANGELOG.md)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.50%. Comparing base (9f6c6a3) to head (c5524ea).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2398   +/-   ##
=======================================
  Coverage   89.50%   89.50%           
=======================================
  Files          78       78           
  Lines        2896     2896           
=======================================
  Hits         2592     2592           
  Misses        304      304           

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