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

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https://hg.mozilla.org/integration/gaia-central/rev/adeb7f719018
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #13737 from steveck-chung/DSDS-sim_switch_for_MMS

Bug 928330 - Notify user to switch to subscription to retrieve the MMS from non-active subscription. r=julienw, a=1.3+

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https://hg.mozilla.org/integration/gaia-central/rev/c28af74a98b3
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 928330 - Notify user to switch to subscription to retrieve the MMS from non-active subscription