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

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https://hg.mozilla.org/integration/gaia-1_3/rev/75b36b499190
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #19464 from petervanderbeken/1013802

Bug 1013802 - Include utils.js in hotspot_test.js so that openDialog is defined r=crh0716
(cherry picked from commit 1b5ea790c10f3ae4fc1c08f04df8c59777b3ef73)

a=tests
Bumping manifests a=b2g-bump
Merge b2g28 to v1.3t. a=merge