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

========

https://hg.mozilla.org/integration/gaia-central/rev/9a73394b5399
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #26944 from cctuan/1114544

Bug 1114544 - [TextSelection] Marionette test for button functionality

========

https://hg.mozilla.org/integration/gaia-central/rev/1d3b78bd8db5
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1114544 - [TextSelection] Marionette test for button functionality
Bumping manifests a=b2g-bump