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

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https://hg.mozilla.org/integration/gaia-central/rev/43ffd77b7149
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #14989 from cctuan/955991

Bug 955991 - [Gaia][Build] Unit Test for settings.js

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https://hg.mozilla.org/integration/gaia-central/rev/7fe66a349c95
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 955991 - [Gaia][Build] Unit Test for settings.js