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

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https://hg.mozilla.org/integration/gaia-central/rev/a3fe5e6c9485
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Merge pull request #16251 from Moz-TedC/master

Bug 965346 - Part 2: Update airplane mode status whenever _enabled flag ...

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https://hg.mozilla.org/integration/gaia-central/rev/9b726753c216
Author: Ted Clancy (:tedders1) <tclancy@mozilla.com>
Desc: Bug 965346 - Part 2: Update airplane mode status whenever _enabled flag is changed. r=alive
Bumping manifests a=b2g-bump