Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/f48ff5e147c0
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #15142 from timdream/bug949044

Bug 949044 - App dimensions is not correctly resize after minimizing the call screen +shepherd

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https://hg.mozilla.org/integration/gaia-1_3/rev/ef5e9d80534d
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 949044 - App dimensions is not correctly resize after minimizing the call screen