Remove explicit dependency to symfony/http-kernel as it's not used directly

[GromNaN]

Missing from #3348

[Copilot]

Pull Request Overview

This PR removes an unused dependency by cleaning up the symfony/http-foundation package from the composer.json requirements and removing an outdated Symfony copyright header from a session handler file.

• Removes symfony/http-foundation dependency from composer.json
• Removes Symfony copyright header from MongoDbSessionHandler.php

Reviewed Changes

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

File	Description
composer.json	Removes unused symfony/http-foundation dependency
src/Session/MongoDbSessionHandler.php	Removes outdated Symfony copyright header

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