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

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https://hg.mozilla.org/integration/gaia-central/rev/118de2eaaad6
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23233 from daleharvey/1057668

Bug 1057668 - Stop ignoring scroll events in browser tab page

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https://hg.mozilla.org/integration/gaia-central/rev/9ab020e84bb0
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1057668 - Stop ignoring scroll events in browser tab page. r=kgrandon
Bumping manifests a=b2g-bump