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

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https://hg.mozilla.org/integration/gaia-central/rev/533dc7862c89
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #17685 from alivedise/bugzilla/963003/attention-screen-on-soft-home

Bug 963003 - Fix attention screen height on software home button shown, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/c3cbe34b1ac3
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 963003 - Fix attention screen height on software home button shown
Bumping manifests a=b2g-bump