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

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https://hg.mozilla.org/integration/gaia-central/rev/1812c1a25e06
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #25509 from dmarcos/bug1087475

Bug 1087475 - [Flame][Camera]The viewfinder will fail to function when t...

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https://hg.mozilla.org/integration/gaia-central/rev/29e53d7ef35c
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 1087475 - [Flame][Camera]The viewfinder will fail to function when the user opens and closes the camera app multiple times via the home button

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https://hg.mozilla.org/integration/gaia-central/rev/b3a55e66993a
Author: Mike Habicher <mikeh@mozilla.com>
Desc: Merge pull request #25668 from justindarc/bug1091820

Bug 1091820 - [Camera] Add hasOwnProperty() check to recorderProfiles loop

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https://hg.mozilla.org/integration/gaia-central/rev/0521bf517be3
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1091820 - [Camera] Add hasOwnProperty() check to recorderProfiles loop
Bumping manifests a=b2g-bump