Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/1a91f8fd91e1
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1069243 - Dont prefetch favicons for history. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/13889a87c71d
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #24270 from albertopq/1067356-notifications-font

Bug 1067356 - Changing notifications font-size r=gmarty

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https://hg.mozilla.org/integration/gaia-central/rev/944aff60f20d
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1067356 - Changing notifications font-size
Bumping manifests a=b2g-bump