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

========

https://hg.mozilla.org/integration/gaia-1_4/rev/721cd4fc6ae1
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #19189 from frsela/STK/Bug1007608_v1.4

Bug 1007608 - [sora][PTCRB][STK]Case 27.22.4.9.4/1 failed in TS 51.010-4, r=arthur.chen

========

https://hg.mozilla.org/integration/gaia-1_4/rev/8936582dc1a9
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Bug 1007608 - [sora][PTCRB][STK]Case 27.22.4.9.4/1 failed in TS 51.010-4
Bumping manifests a=b2g-bump