[TASK] Adjust composer.json declarations of system extensions

In order to compatible with https://getcomposer.org/doc/04-schema.md
composer.json declarations had to be adjusted and dropped previous
replace statements like this:

"replace": {
    "core": "*"
}

Resolves: #89392
Releases: master, 9.5, 8.7
Change-Id: I4d530fe90551b16c54462a81a457d0bff9f2de8b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61944


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Simon Gilli <typo3@gilbertsoft.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Felix P. <f.pachowsky@neusta.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>