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

========

https://hg.mozilla.org/integration/gaia-central/rev/6bb50ae28d58
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #22891 from mcjimenez/bug1053812

Bug 1053812 - Install SV apps on their configured position (r=kgrandon)

========

https://hg.mozilla.org/integration/gaia-central/rev/1f60490f1b21
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 1053812 - Install SV apps on their configured position if they're installed before the Homescreen first run
Bumping manifests a=b2g-bump