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

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https://hg.mozilla.org/integration/gaia-central/rev/848fdea404c9
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #19048 from KevinGrandon/bug_1002293_remove_travis_sudo

Bug 1002293 - Travis CI Fixes

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https://hg.mozilla.org/integration/gaia-central/rev/ef2ce4a8b590
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1002293 - Travis CI Fixes
Bumping manifests a=b2g-bump