[TASK] Update copyright year to 2013

Resolves: #46085
Releases: 6.1, 6.0, 4.7, 4.6, 4.5
Change-Id: Ifc1b4199f17d385cf6ef3d7bc460b1f91e367fc0
Reviewed-on: https://review.typo3.org/18786
Reviewed-by: Ernesto Baschny
Tested-by: Ernesto Baschny