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

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https://hg.mozilla.org/integration/gaia-central/rev/ad85cef857ce
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #21256 from zacc/bug_1032707

Bug 1032707 - Target intermittent clock failures on TBPL

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https://hg.mozilla.org/integration/gaia-central/rev/cbf211f3d5a7
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1032707 - Target intermittent clock failures on TBPL
Bumping manifests a=b2g-bump