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

========

https://hg.mozilla.org/integration/gaia-1_4/rev/29f49512366c
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22983 from sergi/BUG_1014262_1.4

Airplane mode icon in status bar is not responsive (uplifting to v1.4)

========

https://hg.mozilla.org/integration/gaia-1_4/rev/febddb1da58f
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Bug 1014262 - Airplane mode icon in status bar is not responsive
Bumping manifests a=b2g-bump