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

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https://hg.mozilla.org/integration/gaia-central/rev/966c049f50c3
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #13839 from etiennesegonzac/bug-940412-sendtap-delay

Bug 940412 - Augmenting the delay when forging a "tap" from the EdgeSwipeDetector. r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/1d174cdd9bfe
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 940412 - Augmenting the delay when forging a "tap" from the
EdgeSwipeDetector.