PHP_CodeSniffer 4.0

[spaze]

• Require slevomat/coding-standard that uses PHPCS 4.0
• Replace PSR12.Files.FileHeader.SpacingAfterBlock with the new modular rules
  • See PHPCSStandards/PHP_CodeSniffer@c9c4d05 and the upgrade guide.
• Require PHP 7.4, the same as PHPCS now requires

Follow-up:

• Don't require spacing after a docblock in a file header #30

[Copilot]

Pull Request Overview

This PR updates the project to use PHP_CodeSniffer 4.0 by upgrading dependencies and adjusting coding standards rules to maintain compatibility. The changes align with PHPCS 4.0's breaking changes while maintaining the same code quality standards.

• Updates PHP version requirement from 7.2 to 7.4 to match PHPCS 4.0 requirements
• Upgrades slevomat/coding-standard to version that supports PHPCS 4.0
• Replaces deprecated PSR12.Files.FileHeader.SpacingAfterBlock rule with new modular PSR12.Files.FileHeader.SpacingAfterTagBlock

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
composer.json	Updates PHP version requirement and slevomat/coding-standard dependency
src/ruleset.xml	Replaces deprecated PHPCS rule with new modular equivalent

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