[TASK] Add PHP8.3 support to `Build/Scripts/runTests.sh`

This change adds basic support for PHP8.3 to
`Build/Scripts/runTests.sh`. That is done to
get an early chance to evaluate how the core
is behaving against the upcoming PHP version.

Note, no ci runs added for now. First current
existing issues should be fixed first to make
tests green before enabling it for CI runs.

Resolves: #100984
Releases: main, 12.4, 11.5
Change-Id: Icefa0a83f860672ff0d688acb1968185e0bc3053
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79248


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