Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/6a1bfb870558
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #18058 from mcav/gelam-tarako

Bug 991567 - [Tarako][Email] Email app is killed while downloading an at...

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https://hg.mozilla.org/integration/gaia-1_3/rev/acd5c15cf7ab
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #17655 from frsela/STK/Bug988362

Bug 988362 - [STK]The maxlength of the inputbox didn't set corretly in GET_INPUT command. (Increment wait time), r=timdream

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https://hg.mozilla.org/integration/gaia-1_3/rev/39292f51dce7
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Merge pull request #17214 from qdot/983507-flight-mode-radio-off

Bug 983507 - Make airplane mode icon appear via airplaneMode setting, not RIL status
Bumping manifests a=b2g-bump