Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/4ad6d3ee5bd5
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge branch 'v2.0' of https://github.com/mozilla-b2g/gaia into v2.0

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https://hg.mozilla.org/integration/gaia-2_0/rev/203bf43c819f
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #20774 from 6a68/bug-1027950-settings-fmd-onerror-handlers

Bug 1027950 - [Settings][Find My Device] Do not attach handlers inside onerror callback
Conflicts:
	apps/settings/elements/findmydevice.html

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https://hg.mozilla.org/integration/gaia-2_0/rev/adab5764738f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21121 from KevinGrandon/AntonioMA-bug1027708_3

Bug 1027708 - Delay setting the collection datastore listeners until the datastore initial read
Conflicts:
	tests/python/gaia-ui-tests/gaiatest/tests/tbpl-manifest.ini

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https://hg.mozilla.org/integration/gaia-2_0/rev/7adef4fa9722
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21088 from KevinGrandon/lightsofapollo-bug-1027935

Bug 1027935 - Correctly handle pending upgrades as well as pause/resume of upgrade downloads

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https://hg.mozilla.org/integration/gaia-2_0/rev/d2bcf35ab402
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #21075 from vingtetun/bug1028933-landing

Bug 1028933 - Hide the context menu ui when the homescreen is not visibl...
Bumping manifests a=b2g-bump