[TASK] Set TYPO3 version to 4.5.40-dev

Change-Id: Ie043fa8d8cfaf633ac496ca306339f2ba8e663ea
Reviewed-on: http://review.typo3.org/35231
Reviewed-by: TYPO3 Release Team <typo3v4@typo3.org>
Tested-by: TYPO3 Release Team <typo3v4@typo3.org>