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

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https://hg.mozilla.org/integration/gaia-1_3/rev/a5e5a7e20481
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 ...
(cherry picked from commit b30742e845f603441942ed295fa5359d9704b20a)
Bumping manifests a=b2g-bump