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

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https://hg.mozilla.org/integration/gaia-central/rev/69226358dfbb
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #19176 from dmarcos/bug966828

Bug966828

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https://hg.mozilla.org/integration/gaia-central/rev/f0b179c14c17
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 966828 - [User story] Add face tracking capability
Bumping manifests a=b2g-bump