[BUGFIX] Always update index time when saving metadata

Resolves: #101730
Releases: main, 12.4, 11.5
Change-Id: I9e400e1c582f84602b6aa8ef3cdd9a85f4e5b93e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81057


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>