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

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https://hg.mozilla.org/integration/gaia-central/rev/8cdfe7674f6a
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #10466 from Rik/no-multiprocess-884338

Bug 884338 - Travis no likey multiprocess :( r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/c9a5d7b78533
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 884338 - Travis no likey multiprocess :(