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/019ea91918f8
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 961047 - Remove some dead code in Gaia with APZC enabled by default from the platform. r=alive,fabrice