Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/257d6b7821d1
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #26327 from azasypkin/bug-1102168-usage-bad-load-panel-callback

 Bug 1102168 - [Usage] ViewManager.loadPanel never calls callback if panel's scripts/links are already loaded. r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/d0573e5fb968
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1102168 - [Usage] ViewManager.loadPanel never calls callback if panels scripts/links are already loaded. r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/23ce722f3c80
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #26378 from jm-gailis/master

1092573 - include Latvian (lv) in FxOS builds. r=stas

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https://hg.mozilla.org/integration/gaia-central/rev/e904b702446c
Author: Jānis Marks Gailis <jeanmarc.gailis@gmail.com>
Desc: 1092573: Update languages_all.json -> include Latvian (lv) in builds

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https://hg.mozilla.org/integration/gaia-central/rev/6f2fa4fc7f85
Author: Jānis Marks Gailis <jeanmarc.gailis@gmail.com>
Desc: 1092573: Update keyboard-layouts.json to include lv in keyboard list

related to https://bugzilla.mozilla.org/show_bug.cgi?id=1092573
Bumping manifests a=b2g-bump