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

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https://hg.mozilla.org/integration/gaia-1_3/rev/5fcb31e0816a
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #15872 from gabrielesvelto/bug-960507

Bug 960507 - Properly remove the onheld event handler when doing a second call r=etienne
(cherry picked from commit 905a2aa679f6d2ed075d9414ed8f6b35f22153ee)