www/typo3-12: Update to 12.3.0

TYPO3 v12.3 ships with new features for editors, improvements for site
admins and integrators as well as developers.

For details about the release, please see:
https://typo3.org/article/typo3-v123-freeze

PR: 270519
Changes: https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/12.3/Index.html