[TASK] Release version 2.11.3

Resolves: #63348
Releases: 2.11
Change-Id: I3b88cf53179c2cd89105733e0aac620d236820f5
Reviewed-on: http://review.typo3.org/34645
Reviewed-by: Francois Suter <francois@typo3.org>
Tested-by: Francois Suter <francois@typo3.org>