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

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https://hg.mozilla.org/integration/gaia-central/rev/bc780e3410d9
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #16314 from vingtetun/bug965805-v2

Bug 965805 - Calling nsITabParent::InjectTouchEvent can results into an ...

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https://hg.mozilla.org/integration/gaia-central/rev/f42709ce675c
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 965805 - Calling nsITabParent::InjectTouchEvent can results into an out of sync TabParent::mEventCaptureDepth. r=etienne
Bumping manifests a=b2g-bump