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

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https://hg.mozilla.org/integration/gaia-central/rev/5f8a13662ba5
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #13063 from snowmantw/issue906549

Bug 906549 - [Flatfish][LockScreen] add support for large device for portrait

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https://hg.mozilla.org/integration/gaia-central/rev/9041c0f161c2
Author: Greg Weng (snowmantw) <gweng@mozilla.com>
Desc: Bug 906549 - [Flatfish][LockScreen] add support for large device for portrait