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

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https://hg.mozilla.org/integration/gaia-central/rev/6e4866e3453f
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #11866 from mcjimenez/bug893800_2

Bug 893800 - Add a way to insert an app on a given position

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https://hg.mozilla.org/integration/gaia-central/rev/4c23771ec053
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 893800 - Add a way to insert an app on a given position
Bug 911341 - 1/2: B2G RIL - refactor worker_buf. r=yoshi
Bug 911341 - 2/2: Seperate the parcel header handling. r=yoshi