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

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https://hg.mozilla.org/integration/gaia-1_4/rev/08f2a412f6b5
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #18871 from justindarc/bug1000984-v1.4

Bug 1000984 - [Camera] Pinch-to-zoom gesture should be attached to the |...

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https://hg.mozilla.org/integration/gaia-1_4/rev/78c2baa7d36d
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1000984 - [Camera] Pinch-to-zoom gesture should be attached to the |window| object in the DOM
Bumping manifests a=b2g-bump