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

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https://hg.mozilla.org/integration/gaia-central/rev/dc282a61ad78
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #20084 from lissyx/bug1020982

Bug 1020982 - Enable integration test of notification click event r=mhenretty

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https://hg.mozilla.org/integration/gaia-central/rev/0ad428f76467
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 1020982 - Enable integration test of notification click event a=test-only
Bumping manifests a=b2g-bump