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

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https://hg.mozilla.org/integration/gaia-central/rev/9f480d1c52a4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18429 from KevinGrandon/bug_997876_rocketbar_text_input

Bug 997876 - [Rocketbar] Input text should reset after entering homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/5b323487b93e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 997876 - [Rocketbar] Input text should reset after entering homescreen r=benfrancis
Bumping manifests a=b2g-bump