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

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https://hg.mozilla.org/integration/gaia-central/rev/878cc221e0fd
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #11200 from fabi1cazenave/cellBroadcastLabel-bug890151

Bug 890151 - [CB] CH50 message should not be displayed when the Cell Broadcast service is off, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/b10f7f809290
Author: hyuna.cho <hyuna.cho@lge.com>
Desc: Bug 890151 - [CB] CH50 CB message should not be displayed when the Cell Broadcast service is off