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

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https://hg.mozilla.org/integration/gaia-central/rev/560b03022a44
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #17874 from alivedise/bugzilla/989087/attention-screen-invade-app-height

Bug 989087 - Fix layout manager height, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/c6c022e77214
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 989087 - Fix layout manager height
Bumping manifests a=b2g-bump