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

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https://hg.mozilla.org/integration/gaia-central/rev/305cb8b4b2c6
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #25069 from snowmantw/bug1081808

[LockScreen] Decouple the fake-notification styles

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https://hg.mozilla.org/integration/gaia-central/rev/651472870bf1
Author: Greg Weng <snowmantw@gmail.com>
Desc: [LockScreen] Decouple the fake-notification styles
Bumping manifests a=b2g-bump