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

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https://hg.mozilla.org/integration/gaia-central/rev/fd6e22ecc0c7
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23645 from KevinGrandon/bug_1061931_search_notification_string

Bug 1061931 - [Search App] String Change: FTU search suggestion

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https://hg.mozilla.org/integration/gaia-central/rev/16838b02a56a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1061931 - [Search App] String Change: FTU search suggestion r=Pike

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https://hg.mozilla.org/integration/gaia-central/rev/de377db350d1
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #23441 from nullaus/bug1058722

bug 1058722 - Add ability to filter stack when invoking the task manager...

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https://hg.mozilla.org/integration/gaia-central/rev/e1d776f0a176
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1058722 - Add ability to filter stack when invoking the task manager. r=alive
Bumping manifests a=b2g-bump