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/a354fd83651f
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 963173 - Ensure address bar is always displayed when a different tab is selected. r=daleharvey
(cherry picked from commit ac0692fcd9bc59508dc978591cc380f8dcdc7873)