Issue #3588293: Fix PHP 8.4 deprecated nullable parameter in finalize()

Victor Diazrequested to merge
issue/webform_composite-3588293:3588293-fix-php-8.4 into 8.x-1.x

Fixes PHP 8.4 deprecation notice:

"Implicitly marking parameter as nullable is deprecated"

Updated finalize() method to explicitly declare nullable type:

  • ?WebformSubmissionInterface $webform_submission = null

This aligns with Webform core and ensures compatibility with PHP 8.5.

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