[TASK] Update URL to the exception collection

Updated TYPO3_URL_EXCEPTION constant
from http://typo3.org/go/exception/v4/
to http://typo3.org/go/exception/CMS/

Resolves: #49066
Releases: 6.0, 6.1, 6.2
Change-Id: Ibfb36aab1a09a016cda2b378a396390573ff1c6d
Reviewed-on: https://review.typo3.org/21588
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters