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

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https://hg.mozilla.org/integration/gaia-central/rev/d3d4d797d0c5
Author: ochameau <poirot.alex@gmail.com>
Desc: Merge pull request #17533 from jryans/devtools-server-tests

Bug 986223 - Test Dev Tools server toggling r=@ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/3a056e561b21
Author: J. Ryan Stinnett <jryans@gmail.com>
Desc: Bug 986223 - Test Dev Tools server toggling
Bumping manifests a=b2g-bump