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

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https://hg.mozilla.org/integration/gaia-central/rev/58a0c06ea636
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #18518 from alivedise/bugzilla/985037_master/lockscreen-window-visibility

Bugzilla/985037 master/lockscreen window visibility, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/166470de915c
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 985037 - Part 2, fix lockScreenWindow visibility state

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https://hg.mozilla.org/integration/gaia-central/rev/d75d77d9ddcc
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 985037 - Update a11y visiblity management in light of lockscreen changes.

We should not be setting aria-hidden on #windows anymore, instead it should be on individual apps.
Bumping manifests a=b2g-bump