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

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https://hg.mozilla.org/integration/gaia-central/rev/7a950ba56959
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #18520 from zacc/bug_999355

Bug 999355 - Wait for 'render' class on appWindow to denote Gaia startup...

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https://hg.mozilla.org/integration/gaia-central/rev/afd1dfb39c31
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 999355 - Wait for 'render' class on appWindow to denote Gaia startup r=bebe
Bumping manifests a=b2g-bump