Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/6cfb525c2107
Author: Ran Ben Aharon <ran@ranbena.com>
Desc: Bug 1009913 - [E.Me]Loading into a collection shows an empty page [r=amirn]
Bumping manifests a=b2g-bump