Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/a473f889a63e
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15071 from viorelaioia/bug_957141

Bug 957141 - [v1.3] Fix failure in test_settings_airplane_mode

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https://hg.mozilla.org/integration/gaia-1_3/rev/70488d8865ed
Author: askeing <askeing@gmail.com>
Desc: Bug 950570 - Fix test_settings_airplane_mode.py