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

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https://hg.mozilla.org/integration/gaia-central/rev/d126bb88e41f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15422 from KevinGrandon/bug_956648_remove_test_timeouts

Bug 956648 - Remove timeouts from tests

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https://hg.mozilla.org/integration/gaia-central/rev/4a9bde95178b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 956648 - Remove timeouts from tests r=julienw
Bumping manifests a=b2g-bump