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

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https://hg.mozilla.org/integration/gaia-central/rev/34bb6cda673a
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #15461 from Pike/bug-961009-disable-fxa-l10n

bug 961009, stop exposing fxa to l10n until it's done

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https://hg.mozilla.org/integration/gaia-central/rev/da8ebea512f5
Author: Axel Hecht <axel@pike.org>
Desc: bug 961009, stop exposing fxa to l10n until it's done
Bumping manifests a=b2g-bump