Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/24f27472ae6d
Author: Yi-Fan Liao <yliao@mozilla.com>
Desc: Merge pull request #26932 from begeeben/1113538_text_font_of_app_icon

Bug 1113538 - [Stingray] text font of App icon is not correct in App deck, r=tzhuang

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https://hg.mozilla.org/integration/gaia-central/rev/fdedf9626247
Author: Yi-Fan Liao <begeeben@gmail.com>
Desc: Bug 1113538 - [Stingray] text font of App icon is not correct in App deck

* Change styles according to the UI spec
Bumping manifests a=b2g-bump