[TASK] Refer to minor versions for our images in runTests

Allows to auto-update local images for feature-updates
simply by raising them in runTests.sh (like we do for
external images as well).

That means `runTests.sh -u` is only needed in case
patch updates are desired or needed.

Resolves: #102450
Releases: main, 12.4, 11.5
Change-Id: Id9bdd679e430d57794e5d9e48f18ea67ed17d46c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81938


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