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

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https://hg.mozilla.org/integration/gaia-2_0/rev/b964ef3827fc
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1030094 - Block simlock UI and FXA UI on l10n being ready. r=iliu
Bumping manifests a=b2g-bump