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

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https://hg.mozilla.org/integration/gaia-central/rev/5edbd78f77a9
Author: Albert <acperez@tid.es>
Desc: Merge pull request #12180 from acperez/bug-915780

Bug 915780 - Build process fails for operator user variant. r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/1d58908edf61
Author: Albert <acperez@tid.es>
Desc: Bug 915780 - Build process fails for operator user variant. r=yurenju