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

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https://hg.mozilla.org/integration/gaia-central/rev/8cad8de0f7b9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #24901 from KevinGrandon/bug_1075105_ambient_notification_lockscreen_test

Bug 1077579 - [Notifications] Add integration tests for lockscreen ambient indicator, coverage for bug 1075105

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https://hg.mozilla.org/integration/gaia-central/rev/7a4c5f721040
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1077579 - [Notifications] Add integration tests for lockscreen ambient indicator, coverage for bug 1075105 r=mhenretty
Bumping manifests a=b2g-bump