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

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https://hg.mozilla.org/integration/gaia-central/rev/c5a841831c9d
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #21873 from EverythingMe/1038578-sync

Bug 1038578 - [Collection App] Icons are not updated after installing hosted ap...

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https://hg.mozilla.org/integration/gaia-central/rev/9fc21ba1bbb2
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 1038578 - [Collection App] Icons are not updated after installing hosted apps from marketplace
Bumping manifests a=b2g-bump