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

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https://hg.mozilla.org/integration/gaia-central/rev/9c9b560f160e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23497 from zacc/bug_1060462

Bug 1060462 - Avert race condition in gaiatest when interacting with language select menu in Settings app

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https://hg.mozilla.org/integration/gaia-central/rev/af6ce7155433
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1060462 - Avert race condition in gaiatest when interacting with language select menu in Settings app r=qdot
Bumping manifests a=b2g-bump