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

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https://hg.mozilla.org/integration/gaia-central/rev/7fae58dad153
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #20280 from pivanov/bug-1023138

Bug 1023138 - [Flame][Browser]Update missing images

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https://hg.mozilla.org/integration/gaia-central/rev/c9887705965c
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1023138 - [Flame][Browser]Update missing images
Bumping manifests a=b2g-bump