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

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https://hg.mozilla.org/integration/gaia-central/rev/4ad25c0efbf4
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #16089 from viorelaioia/bug_968737

Bug 968737 - Update test_unlock_to_camera_with_passcode to take a picture

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https://hg.mozilla.org/integration/gaia-central/rev/eac6dfb4062e
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 968737 - Update test_unlock_to_camera_with_passcode to take a picture
Bumping manifests a=b2g-bump