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

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https://hg.mozilla.org/integration/gaia-central/rev/bdc21213beac
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #27025 from zbraniecki/1068382-turn-on-multilocale-for-every-build

Bug 1068382 - Switch to use multilocale.js for every build. r=ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/83db2cfc00a7
Author: Zibi Braniecki <gandalf@mozilla.com>
Desc: Bug 1068382 - Switch to use multilocale.js for every build
Bumping manifests a=b2g-bump