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

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https://hg.mozilla.org/integration/gaia-central/rev/9f8cebdcb4c8
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #25973 from KevinGrandon/bug_1095187_debug_download_intermittent_test

Bug 1095187 - Software Home Button - File Open Error Proper layout for file error dialog - Wait for download success +autoland

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https://hg.mozilla.org/integration/gaia-central/rev/fc2c35c6f236
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1095187 - Make SHB file test wait until download complete
Bumping manifests a=b2g-bump