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

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https://hg.mozilla.org/integration/gaia-central/rev/f5df20744bba
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1092362 - Use the default audio channel when playing audible tones outside of calls r=drs,francisco

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https://hg.mozilla.org/integration/gaia-central/rev/5fb00829c724
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #26288 from azasypkin/bug-1100954-set-header-content

Bug 1100954 - Activities menu has no text after forwarding a SMS. r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/86ea5190c23d
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1100954 - Activities menu has no text after forwarding a SMS. r=julien
Bumping manifests a=b2g-bump