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

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https://hg.mozilla.org/integration/gaia-central/rev/3ee47f83858b
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #20056 from EverythingMe/1016233-ui-styling

Bug 1016233 - [Collections App] Collection UI styling

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https://hg.mozilla.org/integration/gaia-central/rev/25772395bd63
Author: Ran Ben Aharon <ran@ranbena.com>
Desc: Bug 1016233 - [Collections App] Collection UI styling
Bumping manifests a=b2g-bump