Log Message:
Update TYPO3 package to 4.5.7.

From release announce:

Dead TYPO3 community,

the TYPO3 core team has just released TYPO3 version 4.5.7, which is now
ready for you to download. This is a maintenance release of the LTS
version of TYPO3v4 and contains bugfixes and a security fix which is
only exploitable by admins.

See this article about the new policy of security team for this situation:

http://buzz.typo3.org/teams/security/article/incident-handling-of-typo3-core-issues/