Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/8986094d6206
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #14993 from comoyo/950607

Bug 950607 - Remove mouse events in Gesture Detector. r=janjongboom

========

https://hg.mozilla.org/integration/gaia-central/rev/06557822568e
Author: Ram Dayal Vaishnav <vaishnav.rd@gmail.com>
Desc: Bug 950607 - Remove mouse events in Gesture Detector

code to handle mouse events is already convert mouse->touch in the touch helper in gecko, so mouse events related code removed. [Bug 950607]