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

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https://hg.mozilla.org/integration/gaia-central/rev/b9883321a4fc
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #19278 from ranjithgithub/1000701_FileNameDoneIconSupport

Bug 1000701-File name & Done icon support, r=johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/8798d6bca1e1
Author: ranjith.gutha <ranjith.gutha@lge.com>
Desc: Bug 1000701-File name & Done icon support
Bumping manifests a=b2g-bump