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

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https://hg.mozilla.org/integration/gaia-central/rev/bf844ea59173
Author: Albert <acperez@tid.es>
Desc: Merge pull request #13920 from acperez/bug-941755

Bug 941755 - Fix wrong format of singlevariant.json r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/fe57b1415619
Author: Albert <acperez@tid.es>
Desc: Bug 941755 - Fix wrong format of singlevariant.json r=yurenju