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

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https://hg.mozilla.org/integration/gaia-central/rev/ae79fff45368
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #11943 from cctuan/911677

Bug 911677 - hide phone-related settings if telephony is not available

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https://hg.mozilla.org/integration/gaia-central/rev/af682d188016
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 911677 - hide phone-related settings if telephony is not available