Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/646c76b5fb2a
Author: gitmai <mri@tid.es>
Desc: Merge pull request #14066 from gitmai/bug-937554-query-settings-data-sim

Bug 937554 -[Cost Control] Query for the data of the current *data SIM* ...

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https://hg.mozilla.org/integration/gaia-central/rev/17910b280fdd
Author: mai <mri@tid.es>
Desc: Bug 937554 -[Cost Control] Query for the data of the current *data SIM* accordingly to settings

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https://hg.mozilla.org/integration/gaia-central/rev/adebe0376441
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #14270 from comoyo/revert_935904

Bug 935904 - Revert "Merge pull request #14262 from comoyo/935904"

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https://hg.mozilla.org/integration/gaia-central/rev/8a2771635d88
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Revert "Merge pull request #14262 from comoyo/935904"

This reverts commit 5684cd760e1644138cbe4733277b3ae442a9bda3, reversing
changes made to 84e58eb4d0a22a10dabfce9d6c28f60b5e50339e.