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

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https://hg.mozilla.org/integration/gaia-central/rev/12249906aac3
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #13166 from lodr/reset-wifi

Bug 932009 - Fixing reset for WiFi

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https://hg.mozilla.org/integration/gaia-central/rev/5e558379ef01
Author: lodr <salva@unoyunodiez.com>
Desc: Bug 932009 - Fixing reset for WiFi