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

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https://hg.mozilla.org/integration/gaia-central/rev/e2b61960ea7c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #16378 from KevinGrandon/bug_971447_system_action_menu_v2

Bug 971447 - [System2] Instantiable ActionMenu r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/f07aab93e438
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 971447 - [System2] Instantiable ActionMenu r=alive
Bumping manifests a=b2g-bump