BUGFIX: Adjust to Php 83 `get_parent_class` deprecation

[mhsdesign]

see https://www.php.net/manual/en/function.get-parent-class.php

Upgrade instructions

Review instructions

Checklist

• [ ] Code follows the PSR-2 coding style
• [ ] Tests have been created, run and adjusted as needed
• [ ] The PR is created against the lowest maintained branch
• [ ] Reviewer - PR Title is brief but complete and starts with FEATURE|TASK|BUGFIX
• [ ] Reviewer - The first section explains the change briefly for change-logs
• [ ] Reviewer - Breaking Changes are marked with !!! and have upgrade-instructions

[mhsdesign]

Must have gone missing while upmerging https://github.com/neos/flow-development-collection/pull/3032 i guess