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

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https://hg.mozilla.org/integration/gaia-central/rev/cf4e8746d209
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #21667 from crdlc/bug-1035084

Bug 1035084 - The statusbar disappears from lockscreen

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https://hg.mozilla.org/integration/gaia-central/rev/7bcd01728ef1
Author: crdlc <crdlc@tid.es>
Desc: Bug 1035084 - The statusbar disappears from lockscreen
Bumping manifests a=b2g-bump