[TASK] Set TYPO3 version to 4.5.38-dev

Change-Id: Ie90485ebcb8da9859020a18cabc19a17e504737c
Reviewed-on: http://review.typo3.org/33462
Reviewed-by: TYPO3 Release Team <typo3v4@typo3.org>
Tested-by: TYPO3 Release Team <typo3v4@typo3.org>