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

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https://hg.mozilla.org/integration/gaia-central/rev/f90148fcad6c
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #12082 from gabrielesvelto/bug-911895-wappush-attention-screen-home

Bug 911895 - Close the WAP Push attention screen when the home button is pressed r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/32c539742f77
Author: Gabriele Svelto <gabriele.svelto@gmail.com>
Desc: Bug 911895 - Close the WAP Push attention screen when the home button is pressed