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

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https://hg.mozilla.org/integration/gaia-central/rev/04baa1447ba4
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16664 from flodolo/bug976966_lockscreentime

Bug 976966 - [System] Make AM/PM localizable

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https://hg.mozilla.org/integration/gaia-central/rev/b518e39a78ef
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 976966 - Make AM/PM localizable in system
Bumping manifests a=b2g-bump