Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/42c5ad53db0a
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #26696 from julienw/1094320-update-gaia-header

Bug 1094320 - It's impossible to have rich HTML markup inside heading el...

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https://hg.mozilla.org/integration/gaia-central/rev/ecffb6ed10b6
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1094320 - It's impossible to have rich HTML markup inside heading elements (h1, h2, h3, h4) if they defined inside gaia-header component r=gmarty

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https://hg.mozilla.org/integration/gaia-central/rev/24b5f81a00c4
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #26534 from lissyx/bug1105639

Bug 1105639 - Release observers when SettingsHelper is done r=kgrandon,arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/92fabecf9fba
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 1105639 - Do not register settings listener multiple times r=kgrandon,arthurcc

SettingsHelper's init() method does add an observer on the setting
value. To avoid leaking, we make sure we are only constructing
SettingsHelper once per setting. We fix this for two observers that were
proved to be leaking: lockscreen.lock-message and powersave.threshold.

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https://hg.mozilla.org/integration/gaia-central/rev/110e9df519ad
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26603 from huchengtw-moz/bug-1105576-update-visual

Bug 1105576 update visual, r=rexboy

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https://hg.mozilla.org/integration/gaia-central/rev/8df379b01f91
Author: John Hu <johu@mozilla.com>
Desc: Bug 1105576 - [Stingray][home] update visual of smart home:
1. background
2. font-style
3. information block
4. icon-fonts
Bumping manifests a=b2g-bump