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

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https://hg.mozilla.org/integration/gaia-central/rev/962718c0f5aa
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #18924 from gasolin/issue-1003736

Bug 1003736 - [Settings] Two column not right displayed, r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/f1be2a2a8772
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1003736 - [Settings] Two column not right displayed
Bumping manifests a=b2g-bump