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

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https://hg.mozilla.org/integration/gaia-central/rev/5f38253a99b5
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #17900 from EverythingMe/989983-original-icons

Bug 989983 - Use un-manipulated app icons for Collection icon [r=ranbena...

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https://hg.mozilla.org/integration/gaia-central/rev/cf0fb983a6ce
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 989983 - Use un-manipulated app icons for Collection icon [r=ranbena]
Bumping manifests a=b2g-bump