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

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https://hg.mozilla.org/integration/gaia-central/rev/8ccaf06cbd38
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #12254 from gabrielesvelto/bug-911247-wappush-url

Bug 911247 - Extract the link from a message and make it clickable r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/0f0fa7af7c21
Author: Gabriele Svelto <gabriele.svelto@gmail.com>
Desc: Bug 911247 - Extract the link from a message and make it clickable r=julienw

- Message contents are now parsed and specific fields extracted
- The messages are now stored as parsed objects into a dedicated
  IndexedDB store instead of as raw text into asyncStorage
- Dismissing the application is supported correctly including when the
  view activity is invoked after clicking on a link. As a consequence of
  this attention screens are not used anymore
- Tests have been added to cover most of the functionality