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

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https://hg.mozilla.org/integration/gaia-central/rev/769997919692
Author: Michał Budzyński <michal@virtualdesign.pl>
Desc: Merge pull request #18783 from michalbe/Bug886754

Bug 886754 - Add highlighting to Contact Search results

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https://hg.mozilla.org/integration/gaia-central/rev/5bce127fd676
Author: Michal Budzynski <michal@virtualdesign.pl>
Desc: [GAIA BUG886754] - Add highlighting to Contact Search results
Bumping manifests a=b2g-bump