[BUGFIX] Ensure extended `XliffFileDumper::dump()` is compatible

The `Symfony\Component\Translation\Dumper\XliffFileDumper` is extended
to add processing workflowes needed to update the xliff files based on
the ISO Database with `Build/Scripts/updateIsoDatabase.php`. Symfony 7
added method types and return types, and therefore the extended method
`dump()` needs a compatible return type.

The corresponding `:void` return type is added now.

Resolves: #103026
Releases: main, 12.4
Change-Id: Id39dbbab9cccffc0b0900267bdc411187623f6fb
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82772


Reviewed-by: Kevin Appelt <kevin.appelt@icloud.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Kevin Appelt <kevin.appelt@icloud.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>