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

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https://hg.mozilla.org/integration/gaia-central/rev/dbb6fec24104
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #14466 from Rik/fast-finish-travis-947295

Bug 947295 - Show Travis build as failing as soon as one job is failing

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https://hg.mozilla.org/integration/gaia-central/rev/336c717c78df
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 947295 - Show Travis build as failing as soon as one job is failing