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

========

https://hg.mozilla.org/integration/gaia-central/rev/0aa03a45f34e
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #12665 from crdlc/bug-923624

Bug Bug 923624 - Avoid overlapping between context menu dialog and wallpaper's menu

========

https://hg.mozilla.org/integration/gaia-central/rev/8e4bc00219e3
Author: crdlc <crdlc@tid.es>
Desc: Bug 923624 - Avoid overlapping between context menu dialog and wallpaper menu