Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e56533c36e91
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19946 from KevinGrandon/bug_1019745_search_remove_dragdrop

Bug 1019745 - [Search] Remove dragdrop feature from gaia-grid

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https://hg.mozilla.org/integration/gaia-central/rev/ce566d8a0c98
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1019745 - [Search] Remove dragdrop feature from gaia-grid r=daleharvey
Bumping manifests a=b2g-bump