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

========

https://hg.mozilla.org/integration/gaia-central/rev/226d26f0b4ab
Author: Jose Antonio Olivera Ortega <josea.olivera@gmail.com>
Desc: Merge pull request #14655 from jaoo/946548

Bug 946548 - [DSDS] [Gaia]: support setting preferred network type for each sim. r=arthurcc

========

https://hg.mozilla.org/integration/gaia-central/rev/34e1b6a23adb
Author: Jose Antonio Olivera Ortega <josea.olivera@gmail.com>
Desc: Bug 946548 - [DSDS] [Gaia]: support setting preferred network type for each sim