Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/2313a283c73a
Author: Michael Schwartz <mschwart@codeaurora.org>
Desc: Bug 1031029 - Unlock the lockscreen only if enabled
Bumping manifests a=b2g-bump