Update PHPStan configuration and enable type treatment

[fadrian06]

This pull request makes a few minor updates to the PHP project's development dependencies and static analysis configuration, primarily to keep tools up to date and improve configuration clarity.

Dependency and configuration updates:

• Updated the phpstan/phpstan development dependency version from ^2.1 to ^2.2 in composer.json to ensure compatibility with the latest features and fixes.
• Added a YAML schema reference to the top of phpstan.dist.neon for improved editor support and validation.

Configuration cleanup:

• Removed the index.php path and the treatPhpDocTypesAsCertain: false parameter from the parameters section in phpstan.dist.neon, likely to streamline static analysis configuration.

[Copilot]

Pull request overview

This pull request updates PHPStan tooling/configuration for the FlightPHP core library to improve static analysis setup and editor support.

Changes:

• Bump phpstan/phpstan from ^2.1 to ^2.2 in composer.json.
• Add a YAML Language Server schema directive to phpstan.dist.neon.
• Simplify PHPStan config by removing index.php from analyzed paths and removing the explicit treatPhpDocTypesAsCertain: false setting.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
phpstan.dist.neon	Adds an editor schema reference and adjusts PHPStan parameters (paths + PHPDoc type treatment setting removal).
composer.json	Updates PHPStan dev dependency version and reorders dev extension requirements.