Remove the dependency on nette/utils

[spaze]

It is still required as a transitive dependency, though.

[Copilot]

Pull Request Overview

This PR removes the direct dependency on nette/utils from the project by eliminating the use of Nette's SmartObject trait and manually implementing its event handling functionality. The change reduces external dependencies while maintaining the same functionality.

• Removed nette/utils from composer.json dependencies
• Replaced SmartObject trait usage with manual event handler implementation
• Updated event invocation from magic method to explicit foreach loop

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/MysqlSessionHandler.php	Removed SmartObject trait and manually implemented onBeforeDataWrite event handling
composer.json	Removed nette/utils dependency from requirements

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