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

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https://hg.mozilla.org/integration/gaia-central/rev/67a734858540
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #17904 from wilsonpage/bug/990255

Bug 990255 - [Camera][Mozilla] 1.4 Zoom bar and indicators are too close...

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https://hg.mozilla.org/integration/gaia-central/rev/374f95d4a049
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 990255 - [Camera][Mozilla] 1.4 Zoom bar and indicators are too close to each other when rotated 180
Bumping manifests a=b2g-bump