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

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https://hg.mozilla.org/integration/gaia-central/rev/9c74ec6a6e91
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #11808 from lodr/bug-909132-limitting-stats-query

Bug 909132 - Adding a minimum date in order to limit the time window to query for.
r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/57a7c64791fc
Author: lodr <salva@unoyunodiez.com>
Desc: Bug 909132 - Adding a minimum date in order to limit the time window to query for