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

========

https://hg.mozilla.org/integration/gaia-central/rev/0d77cac85e97
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #12827 from crdlc/bug-926446

Bug 926446 - Showing/Hiding the svg blurring effect on homescreen icons is expensive during app launch

========

https://hg.mozilla.org/integration/gaia-central/rev/221d1b4b7230
Author: crdlc <crdlc@tid.es>
Desc: Bug 926446 - Showing/Hiding the svg blurring effect on homescreen icons is expensive during app launch