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

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https://hg.mozilla.org/integration/gaia-1_4/rev/9118d7d569c6
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 975343 - Show multiple phone numbers and iccids on dual sim devices
Bumping manifests a=b2g-bump