Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/8a453b73839b
Author: Mihai Cîrlănaru <mihai@cirlanaru.com>
Desc: Merge pull request #11568 from mcirlanaru/bug_899236

Bug 899236 - [Lockscreen] Reintroduce camera button for... r=@alivedise

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https://hg.mozilla.org/integration/gaia-central/rev/f7f67845c67c
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 899236 - [Lockscreen] Reintroduce camera button for passcode input screen. r=alive