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

========

https://hg.mozilla.org/integration/gaia-central/rev/1dff54efd063
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #10774 from huchengtw-moz/settings/Bug_889750_no_action_when_pressed_back_key

Bug 889750 - [Settings] No action when pressed back key after select Fir...r=@crh0716

========

https://hg.mozilla.org/integration/gaia-central/rev/b56f6ac828c2
Author: John Hu <johu@mozilla.com>
Desc: Bug 889750 - [Settings] No action when pressed back key after select Firefox OS privacy