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

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https://hg.mozilla.org/integration/gaia-central/rev/19367dc6b0f9
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #19874 from pacorampas/call-screen-sprites

Bug 1018167 - [Dialer][Call Screen] Change iconpad's icon r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/d9925c84a5c1
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1018167 - [Dialer][Call Screen] Change iconpad's icon
Bumping manifests a=b2g-bump