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

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https://hg.mozilla.org/integration/gaia-central/rev/1aa11949cea8
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18175 from azasypkin/bug-988711-settings-entry

Bug 988711 - [Messages] There is a Settings entry in each single message.

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https://hg.mozilla.org/integration/gaia-central/rev/aec7dbf7ff02
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 988711 - [Messages] There is a Settings entry in each single message. r=julien,zac
Bumping manifests a=b2g-bump