[TASK] Speed up SysLogSerializationUpdate

Speed up the SysLogSerializationUpdate migration wizard
for trivial cases like a:0:{} and a:1:{i:0;s:0:"";}.

Resolves: #100932
Releases: main, 12.4
Change-Id: I6dd35036f18778a1dac012362dbf6ee4fa614703
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79255


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>