refactor: update CI and switch some tooling to Laravel ecosystem

[roelofr]

Fairly big PR for v4

• Updated README for v4.
• Replace php-cs-fixer with Laravel Pint with laravel preset.
• Some updates to the CI:
  • Update most actions to use Node v20 versions.
  • Update formatter to use php 8.3.
  • Update CIs to use a stable and nightly again.
  • Removed the composer.lock, it's not used when installed as dep and might cause issues in dev.

[github-actions[bot]]

Coverage Report

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Lines:	84.59% ( 505 / 597 )