[BUGFIX] Allow deserialization of Area objects for processed files

Currently \TYPO3\CMS\Core\Imaging\ImageManipulation\Area objects
are serialized in processing configuration, therefore we must
allow this class during unserializing the configuration.

Resolves: #91675
Related: #91571
Releases: master, 10.4, 9.5
Change-Id: I8976754abed62e3c9a6205988176b5a1f0220e50
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64907


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>