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

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https://hg.mozilla.org/integration/gaia-central/rev/0472c590f5c3
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #22485 from mcjimenez/bug1048274

Bug 1048274 - Change WiFi to Wi-Fi in locale file (r=flod)

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https://hg.mozilla.org/integration/gaia-central/rev/757977e47f55
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 1048274 - Change WiFi to Wi-Fi in downloadUpdatesVia2GForbidden Id in locale file
Bumping manifests a=b2g-bump