Bump minimum PHP version to 8.4

[simPod]

Summary

This pull request updates the project to require PHP 8.4 as the minimum supported version, and adds PHP 8.5 to the test matrix.

Key Changes

• Updated composer.json to require php: ^8.4 (previously ^8.3)
• Updated CI workflow to test against PHP 8.4 and 8.5 (removed PHP 8.3)
• Updated coding standards workflow to use PHP 8.4
• Updated static analysis workflow to use PHP 8.4
• Updated infection/mutation testing workflow to use PHP 8.4

Details

All GitHub Actions workflows have been aligned to use PHP 8.4 as the baseline version for testing and analysis. The test matrix now includes PHP 8.5 to ensure forward compatibility with the latest PHP version.

https://claude.ai/code/session_01JpmzX6xZs1J8MDDzdgvasZ

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.10%. Comparing base (cf9a9f7) to head (c6fe4c5).
⚠️ Report is 1 commits behind head on 0.7.x.

Additional details and impacted files

@@           Coverage Diff           @@
##            0.7.x     #188   +/-   ##
=======================================
  Coverage   95.10%   95.10%           
=======================================
  Files          10       10           
  Lines         184      184           
=======================================
  Hits          175      175           
  Misses          9        9           

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