[TASK] Streamline log_data fetching

This change now uses allowed_classes=false on all
calls of unserialize() for sys_log.log_data which
we did not have before.

Resolves: #95731
Releases: master
Change-Id: I1619aeba8f9c40696f15e040bc56007ffe3baf48
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71937


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>