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

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https://hg.mozilla.org/integration/gaia-central/rev/e247a559e1a6
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1042032 - Disable test_gallery_view until dwong fixes the phones.
Bumping manifests a=b2g-bump