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

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https://hg.mozilla.org/integration/gaia-central/rev/bb1692d8576a
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #15591 from yurenju/bug962486

Bug 962486 - [regression] customization tool doesn't work r=@timdream

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https://hg.mozilla.org/integration/gaia-central/rev/00dbddd52f82
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 962486 - [regression] customization tool doesn't work
Bumping manifests a=b2g-bump