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

========

https://hg.mozilla.org/integration/gaia-central/rev/15703ea5c432
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #20386 from mcjimenez/bug1015975

Bug 1015975 - Don't use the data enabled value from Single Variant if the user has made changes
r=fcampo

========

https://hg.mozilla.org/integration/gaia-central/rev/86a36bb6d270
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 1015975 - Don't use the data enabled value from Single Variant if the user has made changes
Bumping manifests a=b2g-bump