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

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https://hg.mozilla.org/integration/gaia-central/rev/b83d43f0f3e2
Author: EragonJ (E.J.) <eragonj@eragonj.me>
Desc: Merge pull request #25593 from EragonJ/bug-1090097

Bug 1090097 - [settings] refactor SIM Manager with AMD pattern

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https://hg.mozilla.org/integration/gaia-central/rev/694e827aff72
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1090097 - [settings] refactor SIM Manager with AMD pattern
Bumping manifests a=b2g-bump