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

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https://hg.mozilla.org/integration/gaia-central/rev/d6996a70e52d
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #23819 from pivanov/bug-1058752

Bug 1058752 - [RTL] Camera button alignment is off

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https://hg.mozilla.org/integration/gaia-central/rev/fd17b1d20d83
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1058752 - [RTL] Camera button alignment is off
Bumping manifests a=b2g-bump