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

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https://hg.mozilla.org/integration/gaia-central/rev/f5e8e9587a20
Author: AutomatedTester <dburns@mozilla.com>
Desc: Bug 959197; Update capability check to use platformName instead of platform; r=dhunt
Bumping manifests a=b2g-bump