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

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https://hg.mozilla.org/integration/gaia-central/rev/5bc6aed0447f
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #16813 from frsela/STK_DSDS/Bug951599_v2

Bug 951599 - [DSDS][STK] Display multiple cards in settings, r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/b0b57d6b565a
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Bug 951599 - [DSDS][STK] Display multiple cards in settings, r=arthurcc
Bumping manifests a=b2g-bump