Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/71326624de9d
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #22312 from wilsonpage/1044033

Bug 1044033 - Video Encode: Flicker in the preview can be observed when we

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https://hg.mozilla.org/integration/gaia-central/rev/be90248e0fb4
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1044033 - Video Encode: Flicker in the preview can be observed when we change the resolution in front camera

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https://hg.mozilla.org/integration/gaia-central/rev/f27481618954
Author: Zac <zcampbell@mozilla.com>
Desc: Revert "Revert "Revert "Bug 1039966 - Update gaiatest marionette_client to 0.8.1 and dependency moztest to >= 0.6"""

This reverts commit 81a89d663ab52ec7d7fbfb935ce4899694f05f8c.
Bumping manifests a=b2g-bump