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

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https://hg.mozilla.org/integration/gaia-central/rev/69fb04742e82
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #21199 from dmarcos/bug1024692master

Bug 1024692: limit image decode size to 3mp on 256mb devices

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https://hg.mozilla.org/integration/gaia-central/rev/37278f96aeb6
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 1024692 - camera app is killed during zoom in/zoom out (out of memory) on 256 MB target
Bumping manifests a=b2g-bump