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

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https://hg.mozilla.org/integration/gaia-central/rev/13bc1de946da
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #22800 from snowmantw/issue1043892-rev2

Bug 1043892 - [LockScreen] Solve the visual regression caused by Bug 104...

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https://hg.mozilla.org/integration/gaia-central/rev/db5a66a953f9
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1043892 - [LockScreen] Solve the visual regression caused by Bug 1043821, with panel switching refactoring
Bumping manifests a=b2g-bump