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

========

https://hg.mozilla.org/integration/gaia-central/rev/20dd907f4298
Author: Tzu-Lin Huang <dwi019@gmail.com>
Desc: Merge pull request #26872 from dwi2/bug1106844

Bug 1106844 - [Stingray] prevent focus stays on disabled elements in order to receive keyboard event

========

https://hg.mozilla.org/integration/gaia-central/rev/c46b7184aef1
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1106844 - [Stingray] prevent focus stays on disabled elements in order to receive keyboard event
Bumping manifests a=b2g-bump