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

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https://hg.mozilla.org/integration/gaia-central/rev/9c08a1705b5e
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #18447 from crh0716/995458

Bug 995458 - Only calls the last callback of an async operation r=jaoo

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https://hg.mozilla.org/integration/gaia-central/rev/a80eae20c251
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 995458 - Only calls the last callback of an async operation
Bumping manifests a=b2g-bump