Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8168801f6025
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Merge pull request #19469 from allstarschh/Bug1013792

Bug 1013792 - NFC: Cannot handle NFC tags of ISO_DEP technology. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/a7d83915ffbb
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Bug 1013792 - NFC: Cannot handle NFC tags of ISO_DEP technology. r=alive
Bumping manifests a=b2g-bump