Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/18f9a2ef12b7
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #11609 from lodr/bug-902828-resizing-datalimit-buttons-in-fte

Bug 902828 - Changing size of data limit thresholds inside the FTE
r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/4a44f7daeffd
Author: lodr <salva@unoyunodiez.com>
Desc: Bug 902828 - Changing size of data limit thresholds inside the FTE

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https://hg.mozilla.org/integration/gaia-central/rev/0eb26b238a24
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #11612 from lodr/bug-869916-synchronizing-async-function-nextReset

Bug 869916 - Synchronizing the asynchronous function `nextReset()`
r=leo

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https://hg.mozilla.org/integration/gaia-central/rev/cf542c75cf63
Author: lodr <salva@unoyunodiez.com>
Desc: Bug 869916 - Synchronizing the asynchronous function `nextReset`