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

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https://hg.mozilla.org/integration/gaia-central/rev/4f650e0b3bc3
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #18904 from JohanLorenzo/fix-test_cards_view_kill_apps_with_two_apps

Fix Bug 1003175 - Investigate failure in test_cards_view_kill_apps_with_...

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https://hg.mozilla.org/integration/gaia-central/rev/9a68f4440a49
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Fix Bug 1003175 - Investigate failure in test_cards_view_kill_apps_with_two_apps.py
Bumping manifests a=b2g-bump