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

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https://hg.mozilla.org/integration/gaia-central/rev/e9df8c87d2b4
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #21876 from crh0716/1032629

Bug 1032629 - APN Settings UX refresh r=eragonj, jaoo, gabriele

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https://hg.mozilla.org/integration/gaia-central/rev/cc8738ce9cef
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1032629 - APN settings UX refresh
Bumping manifests a=b2g-bump