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

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https://hg.mozilla.org/integration/gaia-central/rev/91f6a556ea28
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #23175 from justindarc/bug1046115

Bug 1046115 - Flash gets fired automatically when it detects face with f...

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https://hg.mozilla.org/integration/gaia-central/rev/36738f08bd59
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1046115 - Flash gets fired automatically when it detects face with flash ON under low light condition
Bumping manifests a=b2g-bump