Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/d311fcbaf3f0
Author: Albert <acperez@tid.es>
Desc: Bug 917740 - Update file format of customization files based on MCC/MNC r=amac,salva,yurenju