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

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https://hg.mozilla.org/integration/gaia-central/rev/291af1c050ce
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #20633 from autonome/945996

Bug 945996 - cannot take screenshots in some devices because no home but...

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https://hg.mozilla.org/integration/gaia-central/rev/d458e763b003
Author: Dietrich Ayala <autonome@gmail.com>
Desc: Bug 945996 - cannot take screenshots in some devices because no home button (r=timdream)
Bumping manifests a=b2g-bump