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

========

https://hg.mozilla.org/integration/gaia-central/rev/2a67e042d1a4
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #22816 from dmarcos/bug1051200

Bug 1051200 - Camera brightness blocked after touch-focusing on dark zon...

========

https://hg.mozilla.org/integration/gaia-central/rev/b3416dfdf1d7
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 1051200 - Camera brightness blocked after touch-focusing on dark zone
Bumping manifests a=b2g-bump