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

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https://hg.mozilla.org/integration/gaia-central/rev/a66aa7a93fba
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14228 from pivanov/bug-942997

Bug 942997 - [Clock] Update to Dark 1.3 Header

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https://hg.mozilla.org/integration/gaia-central/rev/05f32f79fd41
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 942997 - [Clock] Update to Dark 1.3 Header