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

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https://hg.mozilla.org/integration/gaia-central/rev/f73abec4661e
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #8865 from frsela/STK/Bug847042

Bug 847042: [Buri][STK]ME feedback TR "Command beyond ME's capability" when perform language notification command r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/fb49778e78a4
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: [STK] Implement language selection event download