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

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https://hg.mozilla.org/integration/gaia-central/rev/f7c05f01ac8a
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #13619 from EverythingMe/937615-collection-no-icon

Bug 937615 - [e.me] Collection is not created when API fails to provide ...

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https://hg.mozilla.org/integration/gaia-central/rev/7375a76d80c9
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 937615 - [e.me] Collection is not created when API fails to provide icons