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

========

https://hg.mozilla.org/integration/gaia-central/rev/7f303a67783c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19078 from KevinGrandon/bug_1007909_home2_disable_zoom_during_drag

Bug 1007909 - [Home2] Disable pinch-to-zoom while user is dragging an icon

========

https://hg.mozilla.org/integration/gaia-central/rev/4dfdf143904d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1007909 - [Home2] Disable pinch-to-zoom while user is dragging an icon r=crdlc
Bumping manifests a=b2g-bump