[TASK] Use Bootstrap 3.3.1 in t3skin

Use twbs Bootstrap 3.3.1 release for t3skin.
Notes: https://github.com/twbs/bootstrap/releases/tag/v3.3.1

Resolves: #62890
Releases: master
Change-Id: Ief538e2b18ef77c8290cd94009b517d1a20073db
Reviewed-on: http://review.typo3.org/34041
Reviewed-by: Benjamin Mack <benni@typo3.org>
Reviewed-by: Felix Kopp <felix-source@phorax.com>
Tested-by: Felix Kopp <felix-source@phorax.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>