[RELEASE] Release of TYPO3 4.5.23

Change-Id: I5e9b7cd9903a0419677c9184f7707237402d332d
Reviewed-on: https://review.typo3.org/18277
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team
[TASK] Set TYPO3 version to 4.5.24-dev

Change-Id: I7c5941f836186c44643006c04f75b493b212f67a
Reviewed-on: https://review.typo3.org/18278
Reviewed-by: TYPO3 Release Team
Tested-by: TYPO3 Release Team