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

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https://hg.mozilla.org/integration/gaia-central/rev/37f6005f3b09
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #11399 from gabrielesvelto/bug-902409-parallel-builds

Bug 902409 - Added a missing dependency to the webapp-zip target r=ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/b9abd47eedbf
Author: Gabriele Svelto <gabriele.svelto@gmail.com>
Desc: Bug 902409 - Added a missing dependency to the webapp-zip target