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

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https://hg.mozilla.org/integration/gaia-central/rev/d83a14e3120b
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #24115 from ddrmanxbxfr/bug_1062807

Bug 1062807 - Use the new shared helper for loading JSON files in the wallpaper app r=@yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/772d645178e1
Author: Mathieu Rhéaume <mathieu@codingrhemes.com>
Desc: Bug 1062807 - Use the new shared helper for loading JSON files in the wallpaper app.

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https://hg.mozilla.org/integration/gaia-central/rev/8508a86f2425
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1069415 - Since bug 1002545 landed, we can't commit CSS files under Linux r=yurenju
Bumping manifests a=b2g-bump