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

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https://hg.mozilla.org/integration/gaia-central/rev/ddb5dba71ed1
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #23930 from snowmantw/issue1064630

Bug 1064630 - [Lockscreen] Locking device after entering a passcode leav...

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https://hg.mozilla.org/integration/gaia-central/rev/39ece349b620
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1064630 - [Lockscreen] Locking device after entering a passcode leaves the user in an unrecoverable state
Bumping manifests a=b2g-bump