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

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https://hg.mozilla.org/integration/gaia-central/rev/8afa9636490a
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #15805 from zacc/bug_965276

Bug 965276 - Gaia-ui-tests - set Travis timeout to 10000 a=testonly

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https://hg.mozilla.org/integration/gaia-central/rev/f8efaa2f0fac
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 965276 - Gaia-ui-tests - set Travis timeout to 10000 a=testonly
Bumping manifests a=b2g-bump