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

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https://hg.mozilla.org/integration/gaia-central/rev/77a0a1d62fb6
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #12531 from EverythingMe/910355-collection-offline-icon

Bug 910355 - [e.me][bug] Collection icon auto update

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https://hg.mozilla.org/integration/gaia-central/rev/d66d11ee9fdc
Author: Amir Nissim <amirn@everything.me>
Desc: Bug 910355 - [e.me][bug] Collection icon auto update