Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3f669d1a90a8
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #23270 from weigao123/Bug1057905-master

Bug 1057905 - [master] Avoid activeApp is null when receiving STK message. r=Tim.

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https://hg.mozilla.org/integration/gaia-central/rev/2ace04c6212e
Author: wei.gao <wei.gao@spreadtrum.com>
Desc: Bug 1057905 - [master] Avoid activeApp is null when receiving STK message. r=Tim.

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https://hg.mozilla.org/integration/gaia-central/rev/a06b8efb824c
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21422 from TheoChevalier/bug-841366-set-wallpaper-l10n

Bug 841366 - [l10n][Gallery] Button to set an image as wallpaper from ga...

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https://hg.mozilla.org/integration/gaia-central/rev/2b7e2867be37
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 841366 - [l10n][Gallery] Button to set an image as wallpaper from gallery has not enough space to shown the string in many locales
Bumping manifests a=b2g-bump