Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/42d896c73946
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26444 from huchengtw-moz/bug-1102153-final

Bug 1102153 - [Stingray][home] create button-group and apply to settings..., r=dwi2

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https://hg.mozilla.org/integration/gaia-central/rev/8f29099aee41
Author: John Hu <johu@mozilla.com>
Desc: Bug 1102153 - [Stingray][home] create button-group and apply to settings button in home app

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https://hg.mozilla.org/integration/gaia-central/rev/a8c3b134e184
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #26495 from jincreator/bug1104358

Bug 1104358 - [keyboard] Korean uppercase layout doesn't show vowels, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/30a769ba1208
Author: Jinkyu Yi <jincreator@jincreator.net>
Desc: Bug 1104358 - [keyboard] Korean uppercase layout doesn't show vowels.
Bumping manifests a=b2g-bump