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

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https://hg.mozilla.org/integration/gaia-central/rev/3a2f49b4c398
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #16194 from snowmantw/issue971423

Bug 971423 - [LockScreen] Notifications and music widget behind the passcode pad

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https://hg.mozilla.org/integration/gaia-central/rev/00a2e05b223f
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 971423 - [LockScreen] Notifications and music widget behind the passcode pad
Bumping manifests a=b2g-bump