[TASK] Reduce file size of core images

Reduce the file size without losing quality.
This reduces total typo3 directory size by ~2 MB.

Resolves: #58110
Releases: 6.2
Change-Id: I2062cead3939d93b847f1be741ef8a26bfb0edd8
Reviewed-on: https://review.typo3.org/29617
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Tested-by: Nadir S.
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring