Fix Symfony 7.1 deprecation

[endelwar]

Fix #12

[what-the-diff]

PR Summary

• Updated Symfony Versions for Continuous Integration
  The Symfony versions being used in the continuous integration process have been updated. This ensures that our workflows are tested against the latest and secure versions.

• Changelog Updated to Reflect Deprecated Symfony 7.1 Resolution
  The change log has been updated to mention that the deprecated features from Symfony 7.1 have been handled and resolved in this update. This means that we are keeping our software up-to-date and compatible with the most recent version of Symfony.

• Import Statements Updated in WeasyprintExtension.php
  The import statements in the file WeasyprintExtension.php have been updated. By doing this, we ensure that the correct modules and packages are being imported, which will make our program run more effectively.