Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ac620baf3886
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22530 from KevinGrandon/bug_1048991_rocketbar_home_handling

Bug 1048991 - Home button on search screen should take you back to homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/7f065fa1403e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1048991 - Home button on search screen should take you back to homescreen r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/2c759a65311b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22538 from KevinGrandon/bug_1049154_search_home_screen_naming

Bug 1049154 - [Search] Home screen naming consistency

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https://hg.mozilla.org/integration/gaia-central/rev/5a80457d4ce4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1049154 - [Search] Home screen naming consistency r=amirn

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https://hg.mozilla.org/integration/gaia-central/rev/32ed163c3856
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22537 from KevinGrandon/bug_1049154_collection_home_screen_naming

Bug 1049154 - [Collection App] Home screen naming consistency

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https://hg.mozilla.org/integration/gaia-central/rev/6d25e1e8c417
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1049154 - [Collection App] Home screen naming consistency r=amirn
Bumping manifests a=b2g-bump