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

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https://hg.mozilla.org/integration/gaia-central/rev/9e678fbbf8a8
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #15790 from gasolin/issue-964450

Bug 964450 - [E.me]let entry not overlap by menu while keyboard pop, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/1fc17e09227b
Author: gasolin <gasolin@gmail.com>
Desc: Bug 964450 - [E.me]let entry not overlap by menu while keyboard pop
Bumping manifests a=b2g-bump