[TASK] Bump the version number to 0.5.75.

Change-Id: I79d30722ae45f53b3bba0f87fc838908ab6f2ded
Reviewed-on: http://review.typo3.org/34293
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>