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

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https://hg.mozilla.org/integration/gaia-central/rev/4567d6a94813
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #10752 from Rik/20minutos-889560

Bug 889560 - Remove 20minutos.es from UA overrides r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/fa50062b108d
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 889560 - Remove 20minutos.es from UA overrides