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

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https://hg.mozilla.org/integration/gaia-central/rev/d20c85c379be
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #15734 from etiennesegonzac/bug-963292-fix-edge-sentouchevent-apzc

Bug 963292 - Make the EdgeSwipeDetector event forwarding work with APZC. r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/5065692f39a0
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 963292 - Make the EdgeSwipeDetector event forwarding work with APZC.
r=vingtetun
Bumping manifests a=b2g-bump