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

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https://hg.mozilla.org/integration/gaia-central/rev/dede12f63f59
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1079791 - Hide STK on press home r=kgrandon f=mhenretty

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https://hg.mozilla.org/integration/gaia-central/rev/d11172c4c40a
Author: Albert <alberto.crespellperez@telefonica.com>
Desc: Merge pull request #24918 from acperez/bug-1077329

Bug 1077329 - Delay when closing application. r=gsvelto

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https://hg.mozilla.org/integration/gaia-central/rev/d4561e146725
Author: Albert <alberto.crespellperez@telefonica.com>
Desc: Bug 1077329 - Delay when closing application. r=gsvelto
Bumping manifests a=b2g-bump