Update PHP Version Support and Development Dependencies

[sweep-ai]

This pull request was created by Sweep to resolve the following request by @curtisdelicata:

refactor for php 8.4

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Purpose

Upgrade the library's PHP version support and modernize development dependencies to ensure compatibility with the latest PHP versions and development tools.

Description

This pull request introduces several key updates to the project's configuration and testing infrastructure:

• Upgraded minimum PHP version support from 8.3 to 8.4
• Updated development dependencies to their latest versions
• Modernized PHPUnit configuration with XML schema support
• Refactored test file to use newer PHPUnit testing attributes and syntax

Summary

• Updated composer.json:
  • Changed PHP requirement to >=8.4
  • Updated development dependencies:
    • phpunit/phpunit to ^11.0
    • squizlabs/php_codesniffer to ^3.8
    • rector/rector to ^1.0
    • driftingly/rector-laravel to ^1.0
• Modified tests/phpunit.xml:
  • Added XML schema support
  • Enabled requireCoverageMetadata
• Refactored tests/library/Gedcom/ParserTest.php:
  • Used PHPUnit 11 attributes
  • Improved type declarations
  • Simplified test method assertions