Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/a3bccb1260b4
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #23165 from dmarcos/bug1056347

Bug 1056347 - [Flame] touch to focus circle does not persist

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https://hg.mozilla.org/integration/gaia-2_0/rev/c77d3783e6a3
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 1056347 - [Flame] touch to focus circle does not persist

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https://hg.mozilla.org/integration/gaia-2_0/rev/2ecbe2ff17eb
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #23005 from justindarc/bug1046115-v2.0

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

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https://hg.mozilla.org/integration/gaia-2_0/rev/7593902ab77a
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=2.0+
Bumping manifests a=b2g-bump