[TASK] Set TYPO3 version to 6.2.10-dev

Change-Id: Ifed9c7aafda0c22185ed97301811c115cb5c4b43
Reviewed-on: http://review.typo3.org/35229
Reviewed-by: TYPO3 Release Team <typo3v4@typo3.org>
Tested-by: TYPO3 Release Team <typo3v4@typo3.org>