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

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https://hg.mozilla.org/integration/gaia-central/rev/9898a7e76616
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25672 from KevinGrandon/bug_1091069_progressbar_wait

Bug 1091069 - Follow-up, adjust element wait

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https://hg.mozilla.org/integration/gaia-central/rev/53969f648cf4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1091069 - Follow-up, adjust element wait r=kgrandon
Bumping manifests a=b2g-bump