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

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https://hg.mozilla.org/integration/gaia-central/rev/bfad9b779186
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #26169 from yfdyh000/add_default_theme_to_tablet

Bug 1082516 - add default_theme to Flatfish tablet. r=rchen

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https://hg.mozilla.org/integration/gaia-central/rev/15b1949f162d
Author: YFdyh000 <yfdyh000@gmail.com>
Desc: Bug 1082516 - Add the default_theme to Flatfish tablet build

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https://hg.mozilla.org/integration/gaia-central/rev/ab2b5ddd1894
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1094896 - Make sure we un-highlight the hash key when requesting the IMEI code(s) r=drs
Bumping manifests a=b2g-bump