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

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https://hg.mozilla.org/integration/gaia-central/rev/1efffa083a8e
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #21232 from azasypkin/bug-1008912-mms-label

Bug 1008912 - "MMS" in sms app does not translate into other language. r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/a3bca8c56a9d
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1008912 - "MMS" in sms app does not translate into other language. r=julien
Bumping manifests a=b2g-bump