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

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https://hg.mozilla.org/integration/gaia-central/rev/4ad147defbb4
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #20005 from pivanov/bug-1020194

Bug 1020194 - [Clock]Missing images

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https://hg.mozilla.org/integration/gaia-central/rev/05ee5ea9d375
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1020194 - [Clock]Missing images
Bumping manifests a=b2g-bump